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Number System

Number System
What is the value of ? in the following equations ? 72/? = ?/50

40
60
80
100

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

(?)² = 72 x 50= (6 x 6 x 2) x (5 x 5 x 2)= (6 x 5 x 2)² = (60)²∴ ? = 60

Number System
64% of 2650+40% 0f 320=?

2096
1247
1824
1578

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

1824

Number System
If (35)² is added to the square of a number the answer so obtained is 1394. What is the number ?

15
17
11
13

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the number be x Therefore, x² + (35)² = 1394Therefore, x² = 1394 - (35)²                       = 1394 - 1225                       = 169Therefore, x = √169 = 13

Number System
The difference between a number and its three-fifth is 50. What is the number?

75
100
None of these
125

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

x - 3/5 x = 50 => 2/5 x = 50x = (50 * 5)/2 = 125.

Number System
728.038 x 54.978 - 72.016 x 85.250 = ?

53900
33900
43900
23900

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

? = 728 x 55 - 72 x 85.25 = 40040 - 6138 = 339900

Number System
The sum of the two numbers is 12 and their product is 35. What is the sum of the reciprocals of these numbers?

1/35
7/32
12/35
35/8

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the numbers be a and b. Then,a + b = 12 and ab = 35.(a + b)/ab = 12/35= (1/b + 1/a) = 12/35Sum of reciprocals of given numbers = 12/35.

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