Question

In a city, the air quality index in a particular month is 4.8. It is reduced by 1.6 due to lesser movement of vehicles on the road. What is the current air quality index?

• A. 3.0
• B. 3.4
• C. 4.4
• D. 3.2

Answer 1

The correct option is D 3.2

On the number line, each segment is divided into 10 equal parts.

Hence, the distance between two consecutive parts is 0.1

Locate 4.8 on the number line.

The whole number part of 1.6 is 1.



This can be subtracted by making 10 small jumps towards left on the number line.

Further, jump 6 parts to the left to represent subtraction of 0.6 on the number line.

Now, you reach 3.2

Hence, the current air quality index = 3.2