A ferry can carry 24 buses or 36 cars at a time. If there are 18 buses on the ferry, how many cars can be loaded onto it?

A 6

B 8

C 9

D 12

Correct Answer: Option C

24 buses = 36 cars

or, 1 bus = 36 / 24 cars = 3 /2 cars

Ferry is loaded with 18 buses. Ferry has free space in terms of buses = (24 - 18) buses

= 6 buses

Now,

1 bus = 3 /2 cars

6 buses = 3*6 / 2 cars

= 18 / 2 cars = 9 cars