Number System If 5/7 of a number is 145, what is 180% of that number ? 375.4 345.4 365.4 355.4 375.4 345.4 365.4 355.4 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the number be x.∴ x x 5/7 = 145∴ x = 145 x 7/5 = 203Now, 203 x 180/100 = 365.4
Number System The difference between a two-digit number and the number obtained by interchanging the digits is 36. What is the difference of the two digits of the number ? 1 4 2 3 1 4 2 3 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP (10x + y) - (10y + x) = 36,9(x - y) = 36/9 = 4
Number System A basket contains eight white and ten black balls. Two draws of one ball each are made without replacement. What is the probability that one ball is white and the other ball is black ? 80/152 80/151 80/150 80/153 80/152 80/151 80/150 80/153 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Two balls can be drawn from 18 balls in 18C2 Ways, ie 153 ways. One white from 8 white balls can be drawn in 8C1 = 8 ways and one black ball from 10 black can be drawn in 10C1 = 10 ways.∴ n(S) = 153, n(E) = 8 x 10 = 80∴ P(E) = 80/153
Number System The average of five consecutive even numbers A, B, C, D and E is 42. What is the product of B and D ? 1760 4589 2476 3289 1760 4589 2476 3289 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP A + B + C + D + E/5 = 42∴ C = 42, ∴ B = 40, ∴ D = 44∴ B x D = 40 x 44 = 1760
Number System Supply the missing figure : 2, 6, 12, 20, 30 ... 56 42 40 39 41 42 40 39 41 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 42
Number System (444 x 44 x 4) ÷ 40 ? 2153.6 2053.6 1853.6 1953.6 2153.6 2053.6 1853.6 1953.6 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP ? = 444 x 44 x 4/40 = 1953.6
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