Number System The product of two successive numbers is 4556. Which of the following is the larger of the two numbers? 67 63 78 68 67 63 78 68 ANSWER DOWNLOAD EXAMIANS APP
Number System 7432 ÷ 32 x ? = 2787 12 41 78 21 12 41 78 21 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 7432/32 x ? = 2787= ? = 2787 x 32/7432 = 12
Number System 16.23 x 12.9 + 17.32 = ? 236.687 226.687 None of these 246.687 236.687 226.687 None of these 246.687 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP ? = 16.23 x 12.9 + 17.32= 209.367 + 17.32= 226.687
Number System The difference between a positive proper fraction and its reciprocal is 9/20. The fraction is: 3/10 5/4 4/5 3/5 3/10 5/4 4/5 3/5 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 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 ? 80/151 80/150 80/153 80/152 80/151 80/150 80/153 80/152 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 17580 x 1.8 - 13720 x 2.1 = ? x 2.4 1140 1180 1160 1120 1140 1180 1160 1120 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 2.4 x ? = 31644 - 28812 = 2832∴ ? = 2832/2.4= 1180
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