Problem 1 :
A chemist mixed 6.35 grams of one compound with 2.45 grams of another compound. How many grams were there in the mixture.
Amount of compound in the mixture is
= 6.35 + 2.45
= 8.8 grams
Problem 2 :
If the cost of a pen is $10.50, a book is $25.75 and a bag is $45.50, the find the total cost of 2 books, 3 pens and 1 bag.
Total cost of 2 books, 3 pens and 1 bag is
= 2(25.75) + 3(10.50) + 1(25.75)
= 51.50 + 31.50 + 25.75
Problem 3 :
John wants to buy a bicycle that cost $ 450.75. He has saved $ 125.35. How much more money must John save in order to have enough money to buy the bicycle ?
Amount of money that John still has to save is
= 450.75 - 125.35
Problem 4 :
Jennifer bought 6.5 kg of sugar. she used 3750 grams. How many kilograms of sugar were left ?
3750 grams = 3750/1000 kg
3750 grams = 3.75 grams
Amount of sugar left (in kilograms) is
= 6.5 - 3.75
Problem 5 :
The inner radius of a pipe is 12.625 mm and the outer radius is 18.025 mm. Find the thickness of the pipe.
Thickness of the pipe is
= Outer radius - Inner radius
= 18.025 - 12.625
= 5.40 mm
Problem 6 :
A copy of English book weighs 0.45 kg. What is the weight of 20 copies ?
Weight of 20 copies of English book is
= 20 ⋅ 0.45
= 9 kg
Problem 7 :
Find the weight of 25.5 meters of copper wire in kilograms, if one meter weighs 10 grams.
Weight of 25.5 meters of copper wire is
= 25.5 ⋅ 10
= 255 grams
= 255/1000 kilograms
= 0.255 kilograms
Problem 8 :
Robert paid $140 for 2.8 kg of cooking oil. How much did 1 kg of the cooking oil cost ?
The cost of 1 kg of cooking oil is
= 140 / 2.8
Problem 9 :
If $20.70 is earned in 6 hours, how much money will be earned in 5 hours ?
Amount of money earned in 1 hour is
= 20.70 / 6
Amount of money earned in 5 hours is
= 5 ⋅ 3.45
Problem 10 :
A pipe is 76.8 meters long. What will the greatest number of pieces of pipe each 8 meters long that can be cut from this pipe ?
Greatest number of pieces can be cut from the pipe is
= 76.8 / 8
So, 9 pieces of pipe each 8 meters long can be cut from the pipe of length 76.8 meters.
Apart from the stuff given in this section, if you need any other stuff in math, please use our google custom search here.
If you have any feedback about our math content, please mail us :
We always appreciate your feedback.
You can also visit the following web pages on different stuff in math.
Negative exponents rules
APTITUDE TESTS ONLINE
ACT MATH ONLINE TEST
TRANSFORMATIONS OF FUNCTIONS
ORDER OF OPERATIONS
MATH FOR KIDS
Word problems on linear equations
Trigonometry word problems
Word problems on mixed fractrions
Ratio and proportion shortcuts
Converting repeating decimals in to fractions