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Aptitude - Numbers

Exercise : Numbers - General Questions
11.
5358 x 51 = ?
273258
273268
273348
273358
Answer: Option
Explanation:
5358 x 51 = 5358 x (50 + 1)
= 5358 x 50 + 5358 x 1
= 267900 + 5358
= 273258.
12.
The sum of first five prime numbers is:
11
18
26
28
Answer: Option
Explanation:

Required sum = (2 + 3 + 5 + 7 + 11) = 28.

Note: 1 is not a prime number.

Definition: A prime number (or a prime) is a natural number that has exactly two distinct natural number divisors: 1 and itself.

13.
The difference of two numbers is 1365. On dividing the larger number by the smaller, we get 6 as quotient and the 15 as remainder. What is the smaller number ?
240
270
295
360
Answer: Option
Explanation:

Let the smaller number be x. Then larger number = (x + 1365).

x + 1365 = 6x + 15

5x = 1350

x = 270

Smaller number = 270.

14.
(12)3 x 64 ÷ 432 = ?
5184
5060
5148
5084
None of these
Answer: Option
Explanation:
Given Exp. = (12)3 x 64 = (12)3 x 64 = (12)2 x 62 = (72)2 = 5184
432 12 x 62
15.
72519 x 9999 = ?
725117481
674217481
685126481
696217481
None of these
Answer: Option
Explanation:
72519 x 9999 = 72519 x (10000 - 1)
= 72519 x 10000 - 72519 x 1
= 725190000 - 72519
= 725117481.
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