If 30% of a number exceeds 20% of it by 18, then find the number?

A. 120
B. 200
C. 180
D. 150
E. None of these
Explanation:
Let the number be x.
30% of x = 30/100 * x = 3x/10
20% of x = 20/100 * x = x/5 = 2x/10.
Given that 3x/10 – 2x/10 = 18 => x = 180.
Required number is 180.