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Number System

Number System
How many figures are required for numbering the pages of a book containing 1000 pages?

6489
2883
2893
3892

ANSWER DOWNLOAD EXAMIANS APP

Number System
The average of five consecutive even numbers A, B, C, D and E is 42. What is the product of B and D ?

3289
2476
4589
1760

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

A + B + C + D + E/5 = 42∴ C = 42,   ∴ B = 40,  ∴ D = 44∴ B x D = 40 x 44 = 1760

Number System
How many times the keys of a typewriter have to be pressed in order to write first 400 counting numbers?

1082
1200
1092
1192

ANSWER DOWNLOAD EXAMIANS APP

Number System
450% of a number is 4725. What is 82% of that number ?

871
841
861
851

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the number be x.∴ x x 450/100 = 4725= x = 4725 x 100/450 = 1050∴ 82% of 1050 = 1050 x 82/100= 861

Number System
What least number should be added to 8602 to make it a perfect square ?

47
51
36
41

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

So, (93)² = 8649So, the required number to be added to make a perfect square = 8649 - 8602 = 47

Number System
The product of two consecutive odd numbers is 6723. Find is the greater number.

80
85
77
83

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the first odd number be x.Then, the other odd number would be x + 2.∴ x(x+2) = 6723= x2 + 2x = 6723= x2 + 2x = 6723= x2 + 2x - 6723 = 0= x2 + 83 - 81 x - 6723 = 0= x(x+83) - 81 (x + 83) = 0= (x + 83) (x - 81) = 0= (x + 83) (x - 81) = 0= x - 81 = 0∴ x = 81Hence, greater number = x + 2 = 81 + 2 = 83

MORE MCQ ON Number System

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