Number System If a + b = 16 and ab = 68, what is the value of a² + b² ? 116 124 120 112 116 124 120 112 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP a + b = 16 Therefore, (a+b)² = (16)² = 256 a² + b² + 2ab = 256Therefore, a² + b² = 256 - 2 x 68Therefore, a² + b² = 256 - 136 = 120
Number System The difference between 45% of a number and 18% of the same number is 145.8. What is 30% of that number ? 188 141 245 162 188 141 245 162 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
Number System What is the least number to be subtracted from 696 to make it a perfect square? 16 71 1 20 16 71 1 20 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP The numbers less than 696 and are squares of certain numbers are 676, 625.The least number that should be subtracted from 696 to make it perfect square = 696 - 676 = 20.
Number System If one third of 3/4 of a number is 21. Then find the number? 63 840 84 630 63 840 84 630 ANSWER DOWNLOAD EXAMIANS APP
Number System What is 846 times 323 ? 283298 293798 273258 264258 283298 293798 273258 264258 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 846 x 323 = 273258
Number System Four-fifth of a number is 10 more than two-third of the same number. What is the number? 35 75 91 89 35 75 91 89 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 75
EXAMIANS