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Number System

Number System
If one third of 3/4 of a number is 21. Then find the number?

840
630
84
63

ANSWER DOWNLOAD EXAMIANS APP

Number System
4/6 of 6/5 of 5/7 of a number is 96. Find the number.

168
164
162
170

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the number be x.∴ x x 4/6 x 6/5 x 5/7 = 96∴ x = 96 x 6 x 5 x 7/4 x 6 x 5 = 168

Number System
The sum of the present age of a father and a son is 60 years. Five years before, the age of the father was four times that of son. What is the present age of the son ?

15 years
18 years
25 years
21 years

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the father's age be x and son's age yTherefore, x + y = 60   ....................(i)Five years back, (x - 5) = 4 (y - 5)x - 4y = - 15 ......................(2)Solving (1) and (2), x = 45 and y = 15

Number System
Complete the series : 11, 12, 17, 18, 23, 24 ...

12
30
None of these
14

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

None of these

Number System
The sum of a number and its reciprocal is one-eighth of 34. What is the product of the number and its square root?

8
27
32
None of these

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the number be x. Then,x + 1/x = 34/8 8x2 - 34x + 8 = 0 4x2 - 17x + 4 = 0 (4x - 1)(x - 4) = 0 x = 4required number = 4 * √4 = 4 * 2 = 8.

Number System
What is the average of the following set of numbers ? 173, 192, 198, 204, 211, 223, 227

210
234
204
222

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Avg  = 173 + 192 + 198 + 204 + 211 + 223 + 227/7        = 1428/7        = 204

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