Number System ?125÷5x ?=6265 124 153 1253 1452 124 153 1253 1452 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 1253
Number System The difference between the two digit number and the number obtained by interchanging its digits is 54. The difference between the digits is? 4 1 6 Nothing can be said. 4 1 6 Nothing can be said. ANSWER EXPLANATION DOWNLOAD EXAMIANS APP (10x + y) – (10y + x) = 54x – y = 6
Number System What is the sum of all the prime numbers from 20 to 40? 118 120 117 119 118 120 117 119 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 23 + 29 + 31 + 37 = 120
Number System Subtracting 30 from a number, the remainder is one fourth of the number. Find the number? 40 30 45 22 1/2 40 30 45 22 1/2 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 3/4 x = 30 => x = 40
Number System The sum of a number and its reciprocal is one-eighth of 34. What is the product of the number and its square root? 32 None of these 27 8 32 None of these 27 8 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the number be x. Then,x + 1/x = 34/8 8x2 - 34x + 8 = 0 4x2 - 17x + 4 = 0 (4x - 1)(x - 4) = 0 x = 4required number = 4 * √4 = 4 * 2 = 8.
Number System In how many ways can 5 boys be chosen from 6 boys and 4 girls so as to include exactly one girl ? 60 56 54 58 60 56 54 58 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP One girl can be chosen in 4C1 = 4 ways and 4 boys can be chosen in 6C4 = 15 ways ∴ Total number of ways = 4 x 15 = 60 ways.
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