Aptitude | Arithmetic Aptitude 4 | Question 1

How many numbers between 20 and 451 are divisible by 9?

(A) 44
(B) 48
(C) 50
(D) 52


Answer: (B)

Explanation:

The required numbers are 27, 36, 45……450.

This is an A.P. with a = 27 and d = 9

Let it has n terms.

Then Tn = 450 = 27 + (n-1) x9

∴ 450 = 27+ 9n - 9

∴ 9n = 432

∴ n = 48


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