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:

Updated: April 1, 2020 — 1:12 am