Number System Find the least value of 3x + 4y if x2y3 = 6. 6 3 10 7 6 3 10 7 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 10
Number System (4 86%of 6500) ÷ 36 =? 777.5 977.5 877.5 677.5 777.5 977.5 877.5 677.5 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 877.5
Number System 6.4 x 8.5 x 25/3.2 x 12.5 = ? 2.3 5.6 3.4 4.5 2.3 5.6 3.4 4.5 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP ? = 6.4 x 8.5 x 2.5/3.2 x 12.5 = 3.4
Number System What will be the next number in the following number series ? 162 182 177 191 162 182 177 191 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 1² + 1, 3² + 3, 5² + 5, 7² + 7
Number System An urn contains 9 blue, 7 white and 4 black balls. If 2 balls are drawn at random, then what is the probability that only one ball is white ? 89/190 92/190 91/190 90/190 89/190 92/190 91/190 90/190 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Total possible outcomes = 20C2 = 20 x 19/1 x 2 = 190Total favourable outcomes = 7C1 x 13C1 = 7 x 13 = 91∴ Required probability = 91/190
Number System The difference between a positive proper fraction and its reciprocal is 9/20. The fraction is: 4/5 3/5 5/4 3/10 4/5 3/5 5/4 3/10 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
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