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.
Solution :
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.
Solution :
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
= $108.75
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 ?
Solution :
Amount of money that John still has to save is
= 450.75 - 125.35
= $325.40
Problem 4 :
Jennifer bought 6.5 kg of sugar. she used 3750 grams. How many kilograms of sugar were left ?
Solution :
3750 grams = 3750/1000 kg
3750 grams = 3.75 grams
Amount of sugar left (in kilograms) is
= 6.5 - 3.75
2.75 kg
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.
Solution :
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 ?
Solution :
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.
Solution :
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 ?
Solution :
The cost of 1 kg of cooking oil is
= 140 / 2.8
= $50
Problem 9 :
If $20.70 is earned in 6 hours, how much money will be earned in 5 hours ?
Solution :
Amount of money earned in 1 hour is
= 20.70 / 6
= 3.45
Amount of money earned in 5 hours is
= 5 ⋅ 3.45
= $17.25
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 ?
Solution :
Greatest number of pieces can be cut from the pipe is
= 76.8 / 8
= 9.6
So, 9 pieces of pipe each 8 meters long can be cut from the pipe of length 76.8 meters.
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