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Number System

Number System
486+32×25—59=?

596
567
582
528

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

528

Number System
732.96 + 405.38 - 604.08 - 105.44 + 222.86 = ?

621.68
631.68
651.68
641.68

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

? = 1361.20 - 709.52 = 651.68

Number System
What is the least number that should be added to 5200 to make it a perfect square ?

129
288
275
225

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

We sec (73)² = 5329 and (72)² = 5184ie 5329 > 5200 > 5184So 129 should be added to make is perfect square.

Number System
A, B, C, D and E are consecutive even numbers respectively. The average of 5 numbers is 82. What is the product of C and E ?

6373
6363
6383
6353

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

x + x + 1 + x + 2 + x + 3 + x + 4  = 5 x 82= 5x + 10 = 410 = 5x = 400= x = 400/5 = 80  ∴ A = 80C = 82and E = 84= C x E = 82 x 84 = 6383

Number System
The difference between a positive proper fraction and its reciprocal is 9/20. The fraction is:

4/5
3/10
3/5
5/4

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

1/x - x = 9/20 20x2 + 9x - 20 = 0 20x2 + 25x - 16x - 20 = 0 5x(4x + 5) -4(4x + 5) = 0(4x + 5)(5x - 4) = 0x = 4/5

Number System
The sum of the squares of three numbers is 138, while the sum of their products taken two at a time is 131. Their sum is:

40
30
20
None of these

ANSWER DOWNLOAD EXAMIANS APP
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