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Number System

Number System
If 35% of a number is 899.5, what is 68% of that number ?

1747.6
1847.6
1547.6
2247.6

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Suppose the number is x.Then 35% of x = 899.5∴ 68% of x = 68/35 x 899.5 = 1747.6

Number System
75% of 250 - ?% of 380 = 54.5

31
35
39
33

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

250 x 75/100 - 380 x ?/100 = 54.5= 250 x 75 - 380 x ?= 54.5 x 100= 18750 - 380 x ?= 5450= 380 x? = 18750 - 5450= 13300= ? = 13300/380 = 35

Number System
What is the least number, which is perfect square but contains 2700 as its factor?

5400
10800
1800
2700

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

900 * 3 * 3 = 8100

Number System
[(18.6 x 4.5) + (7.8 ÷ 0.24)] ÷ 3.2 = ?

36.3125
26.3125
46.3125
25.3125

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

? = 83.7 + 32.5/3.2 = 116.2/3.2 = 36.3125

Number System
If a number is multiplied by. three-fourth of itself, the value thus obtained is 10800. What is that number ?

120
260
180
60

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the number be x.∴ x x 3x/4 = 10800= x² = 10800 x 4/3 = 14400∴ x = √14400 = 120

Number System
A two-digit number is such that the product of the digits is 8. When 18 is added to the number, then the digits are reversed. The number is:

42
18
81
24

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the ten's and unit's digit be x and 8/x respectively. Then, (10x + 8/x) + 18 = 10 * 8/x + x 9x2 + 18x - 72 = 0 x2 + 2x - 8 = 0 (x + 4)(x - 2) = 0 x = 2 So, ten's digit = 2 and unit's digit = 4. Hence, required number = 24.

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