Number System If x + y = 61 and xy = 888, What is the value of x²+ y² ? 1955 1965 1975 1945 1955 1965 1975 1945 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Because (x + y)² = x² + y² + 2xy∴ x² + y² = (x + y)² - 2xy∴ x² + y² = (61)² - 2 x 888= 3721 - 1776 = 1945
Number System If (17)3 is subtracted from the square of a number, the answer so obtained is 2143. What is the number ? 82 84 83 81 82 84 83 81 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP x² - (17*17*17) = 2143or x² = 2143 + 4913 = 7056∴ x = 84
Number System What is the sum of the local values of the digits 2, 3, 4, 5 in the number 2345? 2345 2105 5243 2435 2345 2105 5243 2435 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 2000 + 300 + 40 + 5 = 2345
Number System The sum of two numbers is 25 and their difference is 13. Find their product. 325 104 114 315 325 104 114 315 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the numbers be x and y. Then x + y = 25 and x - y = 13.x = 19; y = 6xy = 19 * 6 = 114
Number System What is 432 times 119 ? 50408 51408 52408 53408 50408 51408 52408 53408 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP No. 432 x 119 = 51408
Number System 93296 - 45874 + 20382 - 56817 = ? 109887 109867 109877 109857 109887 109867 109877 109857 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP ? = 113678 - 102691 = 109887
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