TNPSC Number System Aptitude Questions and Answers - 1

Ans: A

Given number is 7386038.

Sum of its digits = 35, which is not divisible by any of 3 and 9.

So, the given number is not divisible by any 3 and 9.

Also, 38 is not divisible by 4.

So, the given number is not divisible by 4.

Ans: D

On dividing 8567 by 4, the remainder is 3.

To make it divisible by 4, we must add 1 to it.

Ans: B

Required numbers are multiples of (10 × 13), i.e., 130.

These numbers are 130, 260, 390, 520, 650, 780 and 910.

They are 7 in number.

Ans: D

Divisor = (555 + 445) = 1000, Quotient = 2(555 – 445) = 2× 110 = 220 and Remainder = 30.

∴ Required number = (1000 × 220) + 30 = 220000 + 30 = 220030.

Ans: B

From 300 to 399, we note that when ‘4’ comes only one time = 19 such instances.

From 400 to 499, we note that when ‘4’ comes only one time = 80 such instances.

So, total = (19 + 80) = 99 such instances.