Question

The tank-full pertrol in Arun’s motor-cycle lasts for 10 days. If he starts using 25% more everyday, how many days will the tank-full pertrol last?  

(a) 5 (b) 6 (c) 7 (d) 8

Answer 1

(d) Let ‘x’ be the initial petrol consumption. Let ‘y’ be the number of days petrol lasts for. According to question

Petrol consumption		Days
Initial	x	10
Final	125/100 x	y

Hence, it’s a case of indirect variation.