Number System In an examination, 68% of the total examinees passed. If the number of failures is 248, the total number of examinees is 775 640 725 750 775 640 725 750 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Failed students are 32% which is 248.∴ Total = 24800/32 = 775
Number System The difference between two integers is 5. Their product is 500. Find the numbers. 30, 25 21, 26 15, 20 20, 25 30, 25 21, 26 15, 20 20, 25 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the integers be x and (x + 5). Then, x(x + 5) = 500 x2 + 5x - 500 = 0 (x + 25)(x - 20) = 0 x = 20So, the numbers are 20 and 25.
Number System 6.4 x 8.5 x 25/3.2 x 12.5 = ? 5.6 3.4 2.3 4.5 5.6 3.4 2.3 4.5 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP ? = 6.4 x 8.5 x 2.5/3.2 x 12.5 = 3.4
Number System If the numberator of a fraction is increased by 50% and denominator by 20% the fraction become 9/15. What was the original fraction ? 6/7 13/25 12/25 3/5 6/7 13/25 12/25 3/5 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the fraction be x/yWe have 150x/120y = 9/15= x/y = 12/25
Number System A box contains 5 red, 4 black and 4 blue balls. If 3 balls are drawn randomly from the box, what is the probability that there are exactly 2 blue balls in the three drawn balls ? 28/144 29/145 27/143 30/146 28/144 29/145 27/143 30/146 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Total balls = 5 + 4 + 4 = 13∴ n(S) = 13C3 = 2862 blue balls can be selected from 4 balls in 4C2 = 6 ways and the remaining one ball is to be selected from 9 balls in 9C1 = 9 ways ∴ n(E) = 6 x 9∴ P(E) = 6 x 9/286 = 27/143
Number System When 102 is reduced from a number, the number gets reduced by 88%. What is that number ? 650 750 850 550 650 750 850 550 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 850
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