**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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