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Number System

Number System
If the difference between a number and its 2/5 is 240, find the number.

480
400
360
440

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the no. be x Therefore x - 2x/5 = 240,        Therefore, 3x/5 = 240Therefore, x = 240x5/3 = 400

Number System
What will be the next number in the following number series ?

182
162
191
177

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

1² + 1, 3² + 3, 5² + 5, 7² + 7

Number System
If 70% of an equal to 40% of b, then ratio between a and b is?

4: 7
None
7: 11
7: 4

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

70 a = 40 ba: b = 4: 7

Number System
If the L.C.M of two numbers is 750 and their product is 18750, find the H.C.F of the numbers.

25
30
50
125

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

H.C.F = (Product of the numbers) / (Their L.C.M) = 18750/750 = 25.

Number System
If the difference between the squares of two consecutive numbers is 47, what is the smaller number ?

24
25
26
23

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the numbers be (x + 1) and x.Therefore, (x + 1)² - x² = 47x² + 2x + 1 - x² = 472x + 1 = 47Therefore, x = 46/2 = 23

Number System
The difference between a two-digit number and the number obtained by interchanging the digits is 36. What is the difference of the two digits of the number ?

1
3
4
2

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

(10x + y) - (10y + x) = 36,9(x - y) = 36/9 = 4

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