Number System Two numbers are in the ratio 3:5. If 9 be subtracted from each, they are in the ratio of 9:17. The first number is: 30 18 36 27 30 18 36 27 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP (3x-9):(5x-9) = 9:17 x = 12 => 3x = 36
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 ? 27/143 28/144 29/145 30/146 27/143 28/144 29/145 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 (164 x 175) x ? = 258300 11 2 9 5 11 2 9 5 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP ? = 258300 / 164 x 175 = 9
Number System The square root of 0.0081 is: 0.09 0.9 0.91 0.009 0.09 0.9 0.91 0.009 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 0.09
Number System A number exceeds by 25 from its 3/8 part. Then the number is? 40 32 39 35 40 32 39 35 ANSWER DOWNLOAD EXAMIANS APP
Number System Four-fifth of a number is 10 more than two-third of the same number. What is the number? 91 89 35 75 91 89 35 75 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 75
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