1.  The tank-full of petrol in Arun's motor-cycle lasts for 10 days. If he starts using 25% more every day, how many days will the tank-full of petrol last ?
A. 5
B. 6
C. 7
D. 8

Answer: Option D

Explanation:

Let us assume that Arun uses N units of petrol everyday. so the amount of of petrol in the tank when it is full will be 10N. If he starts using 25% more petrol everyday. then the units of petrol he now use everyday will be

N(1 + 25/100) = 1.25N

So, the number of days his petrol will now last will be equal to (amount of petrol in tank) / (number of units used everyday)

        = (10N) / (1.25N) = 10 / 1.25

       = 8 days