New Learning Composite Mathematics Class 7 SK Gupta Anubhuti Gangal Percentage and Its Applications Chapter 8E Solution

New Learning Composite Mathematics SK Gupta Anubhuti Gangal Class 7 Percentage and Its Applications Self Practice 8E Solution

(1) Ravi’s class has 19 boys and 12 girls. What is its percentage composition?

(2) Chalk contains 10% calcium, 3% carbon and 12% oxygen. Find the amount of carbon and calcium (in grams) in 2 and 1/2 kg of chalk.

(3) An alloy contains 4% tin, 1% zinc and the remaining copper.

(a) What is the percentage composition of the alloy?

(b) Find the mass (in kg) of each metal in 5 tonnes of the alloy.

(4) A packet of cake mix has the composition of its contents shown on the label. Calculate the percentage composition of the cake mix.

Nutritional  value (per 50 g serve)

Protein

3.5 g
Fat

5.5 g

Carbohydrates

27 g
Other ingredients

14 g


 (5) The average composition (by weight) of milk is shown in the table.

(a) How many grams are there of each component in 1 kg of milk?

(b) How many grams of proteins are there in 7.5 kg of milk?

Ingredients

Percentage

Carbohydrate

5

Protein

3

Fat

4
Water

87

Other

                                                  1

Solution All:


Leave a Reply

Your email address will not be published. Required fields are marked *

sixteen − fifteen =