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Number System

Number System
What is the least number, which is perfect square but contains 2700 as its factor?

2700
1800
5400
10800

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

900 * 3 * 3 = 8100

Number System
The product of two consecutive odd numbers is 4095 What is the greater number ?

65
74
61
69

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the two consecutive odd numbers be 2x - 1 and 2x + 1.(2x - 1) (2x - 1) = 4095= 4x² - 1 = 4095= 4x² = 4096= x² = 1024∴ x = 32∴ The numbers are 63 and 65.Greater number = 65

Number System
4.78% of 1255 + 3.24% of 440=0.5% of ?

14849
12849
11849
13849

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

0.5 x ?/100 = 4.78 x 1255/100 + 3.24 x 440/100= 59.989 + 14.256∴ ? = 74.245 x 100/0.5 = 14849

Number System
What is 846 times 323 ?

293798
264258
273258
283298

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

846 x 323 = 273258

Number System
What is the remainder when 263251 is divided by 9?

8
6
1
3

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

If the sum of the digits of a number is divisible by 9, the number will be divisible by 9.2 + 6 + 3 + 2 + 5 + 1 = 19The nearest multiple of 9 is 18.19 - 18 = 1.

Number System
The sum of three consecutive multiples of 3 is 72. What is the largest number?

21
36
24
27

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the numbers be 3x, 3x + 3 and 3x + 6.Then,3x + (3x + 3) + (3x + 6) = 729x = 63x = 7Largest number = 3x + 6 = 27.

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