# SAT MATH QUESTIONS AND ANSWERS

Question 1 :

Rajesh sells only hats and scarves at his store, for which he charges \$13 and \$7, respectively. On Monday, he sold 15 items and made \$123. How many hats did Rajesh sell on Monday?

(A)  3

(B)  4

(C)  5

(D)  6

Let h be the number of hats and s be the number of scarves sold on Monday.

h + s = 15 ----(1)

13h + 7s = 123 ----(2)

Solve (1) for s.

h + s = 15

s = 15 - h

Substitute s = 15 - h into (2).

13h + 7(15 - h) = 123

13h + 105 - 7h = 123

6h + 105 = 123

6h = 18

h = 3

Rajesh sold 3 hats on Monday.

Therefore, the correct answer choice is (A).

Question 2 :

From where he lives, it costs Jared \$4 more for a roundtrip train ticket to Chaska than it does for one to Waconia. Last month, Jared took roundtrips to Chaska 7 times and to Waconia 8 times. If he spent a total of \$103 on train tickets, how much does Jared spend on one roundtrip ticket to Waconia?

(A)  \$12

(B)  \$10

(C)  \$7

(D)  \$5

Let x be the cost for a roundtrip train ticket to Waconia

Then the the cost for a roundtrip train ticket to Chaska is (x + 4).

7(x + 4) + 8x = 103

7x + 28 + 8x = 103

15x + 28 = 103

15x = 75

x = 5

Jared spends \$5 on one roundtrip ticket to Waconia

Therefore, the correct answer choice is (D).

Question 3 :

(9 + ai)(1 - i) = 12 - 6i

In the equation above, find the value of a, if a is a real number constant and i = √-1.

(A)  6

(B)  3

(C)  2

(D)  -3

i = √-1 ----> i2 = -1

(9 + ai)(1 - i) = 12 - 6i

9 - 9i + ai - ai2 = 12 - 6i

9 - 9i + ai - a(-1) = 12 - 6i

9 - 9i + ai + a = 12 - 6i

a + 9 + ai - 9i = 12 - 6i

(a + 9) + (a - 9)i = 12 - 6i

Compare the coefficients of like terms :

 a + 9 = 12a = 3 a - 9 = -6a = 3

In both the ways, we get the same value for a.

a = 3

Therefore, the correct answer choice is (B).

Question 4 :

3x + 2y = 15

5x - y = 12

Which of the following ordered pairs (x, y) satisfies the system of equations above?

(A)  (3, 3)

(B)  (2, 3)

(C)  (4, 8)

(D)  (5, 0)

3x + 2y = 15 ----(1)

5x - y = 12 ----(2)

x = 3

Substitute x = 3 into (2).

5(3) - y = 12

15 - y = 12

-y = -3

y = 3

Solution :

(x, y) = (3, 3)

Therefore, the correct answer choice is (A).

Question 5 :

12 - 13x > ⁽ˣ ⁺ ¹⁾⁄₍ₓ ₋ ₉₎

Which of the following numbers is a solution to the inequality above?

(A)  5

(B)  3

(C)  1

(D)  0

Instead of solving the given inequality, it is easier to check each of the given answer choices with the given inequality.

Option (A) :

Substitute x = 5.

12 - 13(5) > ⁽⁵ ⁺ ¹⁾⁄₍₅ ₋ ₉₎

-53 > -1.5

(false)

Option (A) :

Substitute x = 3.

12 - 13(3) > ⁽² ⁺ ¹⁾⁄₍₂ ₋ ₉₎

-27 > -0.43

(false)

Option (C) :

Substitute x = 1.

12 - 13(1) > ⁽¹ ⁺ ¹⁾⁄₍₁ ₋ ₉₎

-1 > -0.125

(false)

Option (D) :

Substitute x = 0

12 - 13(0) > ⁽⁰ ⁺ ¹⁾⁄₍₀ ₋ ₉₎

12 > -¹⁄₉

(true)

Therefore, the correct answer choice is (D).

Question 6 :

The audience of a reality TV show cast a total of 3.4 million votes and each vote went to either Brian or Susan. If Susan received 34,000 more votes than Brian, what percent of votes were cast for Brian?

(A)  45%

(B)  49%

(C)  49.5%

(D)  49.9%

Given : Total number of votes is 3.4 million.

x + (x + 34,000) = 34,00,000

x + x + 34,000 = 34,00,000

2x + 34,000 = 34,00,000

2x = 33,66,000

x = 16,83,000

Percent of votes were cast for Brian :

= 49.5%

Therefore, the correct answer choice is (C).

Question 7 :

Marisol has two different methods of commuting to and from work : she either takes the subway, which costs \$2.75 per one-way trip, or she takes a car service, which costs \$18.50 per one-way trip. Last week, she worked 5 days, commuting to and from work each day. If her total commuting cost for the week was \$74.75, how many times did she take the car service?

(A)  2

(B)  3

(C)  4

(D)  6

Last week she worked 5 days, commuting to and from work each day.

Total number of one-way trip :

= 2(5)

= 10

Let x be the number one-way trip in subway and y be the number of one-way trip in car service.

x + y = 10 ----(1)

2.75x + 18.5y = 74.75 ----(2)

Solve for x in (1).

x + y = 10

x = 10 - y

Substitute x = 10 - y into (2).

2.75(10 - y) + 18.5y = 74.75

27.5 - 2.75y + 18.5y = 74.75

27.5 - 2.75y + 18.5y = 74.75

15.75y + 27.5 = 74.75

15.75y = 47.25

y = 3

The number of one-way trip, Marisol takes car service is 3.

Therefore, the correct answer choice is (B).

Question 8 :

V(n) = 8100(⁷⁄₆)n

﻿A number of years ago, Andy purchased \$8,100 worth of stock in PGHH Corporation. The value, in dollars, of his stock n years after purchase is given by the function V, above. If the stock is worth 11,000 now, roughly how many years ago did Andy purchase his stock?﻿

(A)  Five

(B)  Four

(C)  Three

(D)  Two

V(5) = 8100(⁷⁄₆)5

V(5) = 8100(1.17)n

It is easier to tolve this problem by checking the given answer choices.

Option (A) :

Substitute n = 5 into the given function.

V(5) = 8100(1.17)5

V(5) ≈ 17,759

Option (B) :

Substitute n = 4 into the given function.

V(4) = 8100(1.17)4

V(4) ≈ 15,178

Option (C) :

Substitute n = 3 into the given function.

V(4) = 8100(1.17)3

V(4) ≈ 12,973

Option (D) :

Substitute n = 2 into the given function.

V(2) = 8100(1.17)2

V(2) ≈ 11,088

The value of V(2) is close to \$11,000.

Therefore, the correct answer choice is (D).

Question 9 :

The two triangles in the figure above, labeled A and B, each have the same area. The base of triangle B is p percent longer than the base of triangle A, and the height of triangle B is r percent less than the height of triangle A. If p - r = 5, which of the following could be the value of p ?

(A)  15

(B)  18

(C)  23

(D)  25

Let the base and height of triangle A be 100 each.

Area of triangle = (½)base ⋅ height

Area of triangle A :

= (½)100 ⋅ 100

= 5000

From the given information,

base of triangle B = 100 + p

height of triangle B = 100 - r

Area of triangle B :

= (½)(100 + p) ⋅ (100 - r)

Given : Both the triangles have the same area.

(½)(100 + p) ⋅ (100 - r) = 5000

(100 + p)(100 - r) = 10000

10000 - 100r + 100p - pr = 10000

100p - 100r - pr = 0

100(p - r) - pr = 0

Substitute p - r = 5

100(5) - pr = 0

500 - pr = 0

pr = 500

Since p - r = 5, r = p - 5.

p(p - 5) = 500

p2 - 5p = 500

p2 - 5p - 500 = 0

p2 - 25p + 20p - 500 = 0

p(p - 25) + 20(p - 25) = 0

(p - 25)(p + 20) = 0

p - 25 = 0  or  p + 20 = 0

p = 25  or  p = -20

We can ignore the ngative value of p. So, p = 25

Therefore, the correct answer choice is (D).

Question 10 :

In the xy-plane, a line containing the points (a, a3) and (10, 40) passes through the origin. Which of the following could be the value of a?

(A)  -3

(B)  -2

(C)  3

(D)  4

The given line passes through the following three points.

(a, a3), (10, 40), (0, 0)

Formula to find the slope of a line joining two points :

Substitute (x1, y1) = (a, a3) and (x2, y2) = (10, 40) to get the slope of the given line.

Substitute (x1, y1) = (10, 40) and (x2, y2) = (0, 0) to get the slope of the given line.

Both (1) and (2) give the slope of the given line.

40 - a3 = 4(10 - a)

40 - a3 = 40 - 4a

-a3 = -4a

a3 = 4a

a3 - 4a = 0

a = 0  or  a2 - 4 = 0

Solve a2 - 4 = 0.

a2 - 4 = 0

a2 - 22 = 0

(a + 2)(a - 2) = 0

a = -2  or  a = 2

We get three values for a

a = -2, 0, 2

We have -2 in the answer choice (B).

Therefore, the correct answer choice is (B).

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