# NCERT Class 8 Mathematics Solutions: Chapter 8 – Comparing Quantities Exercise 8.1 Part 1

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**Question: 1** Find the ratio of the following:

(a) Speed of a cycle 15 km per hour to the speed of scooter 30 km per hour.

(b) 50m to 10km

(c) 50 Paise to Rs.5

**Answer:**

**(a)** Speed of a cycle 15 km per hour to the speed of scooter 30 km per hour.

Speed of cycle

Speed of scooter

Hence ratio of speed of cycle to speed of scooter

**(b)** 50m to 10km

Ratio =

**(c)** 50 Paise to Rs.5

Hence, Ratio

Convert the ratio to percentage

**Question 2:** Convert the following ratio to percentage:

(a) 3:4

(b) 2:3

**Answer:**

**(a)**

Percentage of

**(b)**

Percentage of

**Question: 3** 72% of 25 students are good in mathematics. How many are not good in mathematics?

**Answer:** Total number of student = 25

Number of good student in mathematics

Number of good student in mathematics

Hence, percentage of students not good in mathematics