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Number System

Number System
Ratio between two numbers is 3: 4 and their sum is 420. Find the smaller number?

160
140
240
180

ANSWER DOWNLOAD EXAMIANS APP

Number System
Find the number, when 15 is subtracted from 7 times the number, the result is 10 more than twice of the number

15
4
7.5
5

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the number be x.7x -15 = 2x + 10 => 5x = 25 => x = 5

Number System
The difference between a two-digit number and the number obtained by interchange the two digits of the number is 27. If the sum of the two digits of the number is 13, what is their product ?

39
37
40
38

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the number be 10x + y.∴ 10x + y - (10y + x) = 27or 9x - 9y = 27∴ x - y = 3 .......(I)x + y = 13 .......(II)From eqn (I) and (II)x = 8 and y = 5.So the number = 85Therefore, product = 8 x 5 = 40

Number System
What is the greater of the two numbers whose product is 2560, given that the sum of the two numbers exceeds their difference by 64?

110
100
90
None of these

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the greater and the smaller number be g and s respectively.gs = 2560g + s exceeds g - s by 64 i.e., g + s - (g - s) = 64i.e., 2s = 64 => s = 32.g = 2560/s = 80.

Number System
What is the sum of all the composite numbers up to 20?

128
131
132
130

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

4 + 6 + 8 + 9 + 10 + 12 + 14 + 15 + 16 + 18 = 132

Number System
Which choice provides the answer in the following : If 2 * 3 = 36, 5 * 4 = 400, 6 * 2 = 144, 3 * 3 = 81; then, 5 * 5 = ?

425
625
325
525

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

625

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