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Number System

Number System
A number exceeds by 25 from its 3/8 part. Then the number is?

39
32
40
35

ANSWER DOWNLOAD EXAMIANS APP

Number System
Find the smallest number which should be multiplied with 520 to make it a perfect square.

None of these
55
120
30

ANSWER DOWNLOAD EXAMIANS APP

Number System
In how many ways can 5 boys be chosen from 6 boys and 4 girls so as to include exactly one girl ?

54
60
58
56

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

One girl can be chosen in 4C1 = 4 ways and 4 boys can be chosen in 6C4 = 15 ways ∴ Total number of ways = 4 x 15 = 60 ways.

Number System
If the sum of four consecutive numbers is 370, which the following is the third lowest number among them

90
89
92
91

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the four consecutive numbers be x, (x + 1), (x + 2), (x + 3) thenx + (x + 1) + (x + 2) + (x + 3) = 370= 4x + 6 = 370∴ x = 364/4 = 91∴ third lowest number among them = x + 1= 91 + 1 = 92

Number System
If the numberator of a fraction is increased by 50% and denominator by 20% the fraction become 9/15. What was the original fraction ?

6/7
3/5
13/25
12/25

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the fraction be x/yWe have 150x/120y = 9/15= x/y = 12/25

Number System
65 x 288 ÷ 52 = 1.8 x ?

200
210
180
190

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

? = 65x288/52x1.8 = 200

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