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Number System

Number System
What is the sum of 1 + 2 + 3+ ... + 27 ?

378
343
396
382

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Sum = 27 x (27 + 1)/2= 27 x 28/2= 27 x 14= 378

Number System
A gardener wants to plant trees in his garden in such a way that the number of trees in each row should be the same. If there are 4 rows or 5 rows or 6 rows, then no tree will be left. Find the least

60
120
30
240

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

The least number of trees that are required = LCM(4, 5, 6) = 60.

Number System
What least number shall be added to 4700 to make it a perfect square ?

71
81
91
61

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

(69)² = 4761 and (68)² = 4624Clerly 4624 < 4700 < 4761So 61 should be added to make 4700 a perfect square.

Number System
A number when divided by 221 gives a remainder 43, what remainder will be obtained by dividing the same number 17?

5
11
9
10

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

221 + 43 = 264/17 = 9 (Remainder)

Number System
1089/? = ?/1296

1082
1188
1348
1278

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

(?)² = 1089 x 1296(?)²= (11 x 11 x 9) x (12 x 12 x 9)(?)= 11 x 12 x 9= 1188

Number System
The sum of two numbers is 22. Five times one number is equal to 6 times the other. The bigger of the two numbers is:

16
12
15
10

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the numbers be x and (22 - x). Then,5x = 6(22 - x) 11x = 132 => x = 12So, the numbers are 12 and 10.

MORE MCQ ON Number System

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