# NCERT Solutions for Class 7 Maths Chapter 8 Comparing Quantities Ex 8.2

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Textbook | NCERT |

Board | CBSE |

Category | NCERT Solutions |

Class | Class 7 |

Subject | Maths |

Chapter | Chapter 8 |

Chapter Name | Comparing Quantities Ex 8.2 |

Number of Questions Solved | 6 |

## NCERT Solutions for Class 7 Maths Chapter 8 Comparing Quantities Ex 8.2

**NCERT TEXTBOOK EXERCISES**

**Question 1.**

Convert the given fractional numbers to per cents.

**(a)** 1/8**(b)** 5/4**(c)** 3/40**(d)** 2/7

**Solution:**

**Question 2.**

Convert the given decimal fractions to per cents.

**(a)** 0.65**(b)** 2.1**(c) **0.02**(d)** 12.35

**Solution:**

**Question 3.**

Estimate what part of the figures is coloured and hence find the percent which is coloured.

**Solution:**

**Question 4.**

Find:

**(a)** 15% of 250**(b)** 1% of 1 hour**(c)** 20% of ₹ 2500**(d)** 75% of 1 kg.

**Solution:**

**Question 5.**

Find the whole quantity if

**(a)** 5% of it is 600.**(b)** 12% of it is ₹ 1080.**(c)** 40% of it is 500 km.**(d)** 70% of it is 14 minutes.**(e)** 8% of it is 40 liters.

**Solution:**

**Question 6.**

Convert given percents to decimal fractions and also to fractions in the simplest forms.

**(a)** 25%**(b)** 150%**(c)** 20%**(d)** 5%

**Solution:**

**Question 7.**

In a city, 30% are females, 40% are males, and the remaining are children. What percent are children?**Solution:**

[100% (30% + 40%)] are children

⇒ [100% – 70% ] are children

⇒ 30% are children.

**Question 8.**

Out of 15,000 voters in a constituency, 60% voted. Find the percentage of voters who did not vote. Can you now find how many actually did not vote?**Solution:**

Percentage of voters who voted = 60%

Percentage of voters who did not vote = (100 – 60)% = 40%

Total number of voters = 15000

Number of voters who did not vote = 40% of 15000

= ( $\frac { 40 }{ 100 }$ × 15000 )

= 6000

**Question 9.**

Meeta saves ₹ 400 from her salary. If this is 10% of her salary. What is her salary?**Solution:**

Let her salary be ₹ P. Then, 10% of P = 400

⇒ $\frac { 10 }{ 100 }$ × p = 400

⇒ $\frac { P }{ 10 }$ = 400

⇒ P = 400 × 10

⇒ P = 4000

Hence, her salary is ₹ 4000.

**Question 10.**

A local cricket team played 20 matches in one season. It won 25% of them. How many matches did they win?**Solution:**

Out of 100, 25% matches are won. Then, out of 20, the number of matches that the team won

= $\frac { 25 }{ 100 }$ × 20

= 1/4 × 20

= 5

## NCERT Solutions for Class 7 Maths Chapter 8 Comparing Quantities Ex 8.2 PDF

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