Question

3. Chalk contains 10% calcium, 3% carbon and

2% oxygen. The amount of each of these in 1 kg chalk is​

Answer 1

Answer:

100,30,20 grams respectively

Step-by-step explanation:

1kg=1000gram

1. Calcium(10%)= (10/100)*1000

=100 gram

2.carbon (3%)= (3/100)*1000

=30 gram

3. oxygen (2%)=(2/100)*1000

= 20 gram

hope it helps u

Answer 2

Answer:

Step-by-step explanation:

Q. 102

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

Class 7th

NCERT - Exemplar Mathematics

7. Comparing Quantities

Answer :

Given, percentage of calcium in chalk = 10%

Percentage of carbon in chalk = 3%

Percentage of oxygen in chalk = 2%

= 2.5 × 1000 = 2500gm

⇒ Amount of carbon in chalk = 3% of 2500 = 0.03 × 2500

= 75

⇒ Amount of Calcium in chalk = 10% of 2500 = 0.1 × 2500

= 250

percentage of oxygen= 2%, = 0.02 x 2500= 50

∴ amount of carbon and calcium respectively is 75 and 250

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