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Number System

Number System
What is 50% of 40% of Rs. 3,450?

690
670
630
640

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

40% * 3450 = 1380then, 50 % * 1380 = 690

Number System
The average of five consecutive even numbers A, B, C, D and E is 54. What is the product of'B' and 'E' ?

2871
3016
4098
1456

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Because, The even numbers are consecutive and their average is 54.∴ The number C will be 54.∴ A = 50, B = 52, D = 56, E = 58B x E = 52 x 58 = 3016

Number System
Two-third of a positive number and 25/216 of its reciprocal are equal. The number is:

12/5
25/144
144/25
5/12

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the number be x. Then,2/3 x = 25/216 * 1/xx2 = 25/216 * 3/2 = 25/144 x = 5/12

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

128
130
131
132

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

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

Number System
What value should come in place of ? in the given number series ? 15, 51, 162, 498, 1509, ?

4545
7878
3434
5656

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

15, (15 + 2) x 3 = 51,(51 + 3) x 3 = 162, (162 + 4) x 3 = 498, (498 + 5) x 3 = 1509(1509 + 6) x 3 = 4545

Number System
The product of two natural numbers is 17. Then, the sum of the reciprocals of their squares is:

289/290
290/289
1/289
289

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the numbers be a and b. Then,ab = 17, a = 1 and b = 17So, 1/a2 + 1/b2 = (a2 + b2)/a2 b2 = (12 + 172)/(1 * 17)2 = 290/289

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