Number System What least number shall be added to 4700 to make it a perfect square ? 71 81 61 91 71 81 61 91 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP (69)² = 4761 and (68)² = 4624Clerly 4624 < 4700 < 4761So 61 should be added to make 4700 a perfect square.
Number System What is the least number that should be added to 5200 to make it a perfect square ? 129 225 275 288 129 225 275 288 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP We sec (73)² = 5329 and (72)² = 5184ie 5329 > 5200 > 5184So 129 should be added to make is perfect square.
Number System The product of two consecutive position odd numbers is 6723. What is the smaller number? 71 83 79 74 71 83 79 74 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP n x (n + 2) = 6723= n² + 2n - 6723 = 0= n² + 83n - 81n - 6723 = 0= n(n + 83) - 81 (n + 83) = 0Therefore, (n - 81) (n + 83) = 0Therefore, n = 81, n + 2 = 83
Number System Find the least number when successively divided by 2, 3 and 7 leaves remainders 1, 2 and 3 respectively? 61 75 65 67 61 75 65 67 ANSWER DOWNLOAD EXAMIANS APP
Number System If A = 1, B = 3, C = 5 and so on, what do the numbers 3, 9, 7 stand for BED CAT CAR BAT BED CAT CAR BAT ANSWER EXPLANATION DOWNLOAD EXAMIANS APP BED
Number System The difference between 45% of a number and 18% of the same number is 145.8. What is 30% of that number ? 188 162 141 245 188 162 141 245 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the number be x.45% of x - 18% of x = 145.8∴ x/100 (45 - 18) = 145.8∴ x = 145.8 x 100/27 = 540∴ 30% of 540 = 540 x 30/100 = 162
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