Number System (12.11)2 + (?)2 = 732.2921 24.2 20.2 14.2 17.2 24.2 20.2 14.2 17.2 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 24.2
Number System If A + B = 30 and AB = 94, What is the value of A² + B² ? 920 625 712 824 920 625 712 824 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP (A + B)² = (30)² = 900A² + B² + 2AB = 900Therefore, A² + B² = 900 - 2 x 94 = 900 - 188 = 712
Number System Find the smallest number which should be multiplied with 520 to make it a perfect square. None of these 30 120 55 None of these 30 120 55 ANSWER DOWNLOAD EXAMIANS APP
Number System If the difference between a number and its three fifths is 62, what is the number ? 165 155 145 175 165 155 145 175 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the number be x.∴ x - 3x/5 = 62or x = 62 x 5/2 = 155
Number System If the sum and difference of two numbers are 20 and 8 respectively, then the difference of their square is: 180 160 12 28 180 160 12 28 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the numbers be x and y. Then, x + y = 20 and x - y = 8x2 - y2 = (x + y)(x - y) = 20 * 8 = 160.
Number System The product of two consecutive position odd numbers is 6723. What is the smaller number? 79 83 71 74 79 83 71 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
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