Number System A two-digit number is such that the product of the digits is 8. When 18 is added to the number, then the digits are reversed. The number is: 24 18 81 42 24 18 81 42 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the ten's and unit's digit be x and 8/x respectively. Then, (10x + 8/x) + 18 = 10 * 8/x + x 9x2 + 18x - 72 = 0 x2 + 2x - 8 = 0 (x + 4)(x - 2) = 0 x = 2 So, ten's digit = 2 and unit's digit = 4. Hence, required number = 24.
Number System 65 x 288 ÷ 52 = 1.8 x ? 190 210 180 200 190 210 180 200 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP ? = 65x288/52x1.8 = 200
Number System How many times the keys of a typewriter have to be pressed in order to write first 400 counting numbers? 1192 1200 1082 1092 1192 1200 1082 1092 ANSWER DOWNLOAD EXAMIANS APP
Number System Find the number, when 15 is subtracted from 7 times the number, the result is 10 more than twice of the number 15 7.5 5 4 15 7.5 5 4 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the number be x.7x -15 = 2x + 10 => 5x = 25 => x = 5
Number System In a two-digit number, the digit in unit's place is two more than three times the digit in ten's place. If the sum of the two digits is 10, what is the number ? 18 24 28 22 18 24 28 22 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the number be 10x + y.∴ y = 3x + 2 .......(i)And, x + y = 10 ......(ii)From (i) and (ii), x = 2, y = 8∴ Number = 28
Number System Find the least value of 3x + 4y if x2y3 = 6. 7 6 3 10 7 6 3 10 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 10
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