Number System What is the least number that should be added to 5200 to make it a perfect square ? 288 275 129 225 288 275 129 225 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 If (17)3 is subtracted from the square of a number, the answer so obtained is 2143. What is the number ? 83 82 81 84 83 82 81 84 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP x² - (17*17*17) = 2143or x² = 2143 + 4913 = 7056∴ x = 84
Number System What is the sum of 1 + 2 + 3+ ... + 27 ? 378 343 396 382 378 343 396 382 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Sum = 27 x (27 + 1)/2= 27 x 28/2= 27 x 14= 378
Number System If (74)² is added to the square of a number the answer so obtained is 7780. What is the number ? 49 48 47 50 49 48 47 50 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the number be x.or, x² + (74)² = 7780or, x² = 7780 - 5476 = 2304∴ x = 48
Number System √343 = ? 19 21 18 20 19 21 18 20 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP ? = √343 = 18
Number System If one-seventh of a number is 55 then 40% of that number = ? 154 171 147 163 154 171 147 163 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the no. be x , Therefore, x/7 = 55Therefore, x = 55 x 7 = 385Therefore, 49% of 385 = 154
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