Number System What is the value of ? in the following equations ? 72/? = ?/50 60 100 40 80 60 100 40 80 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP (?)² = 72 x 50= (6 x 6 x 2) x (5 x 5 x 2)= (6 x 5 x 2)² = (60)²∴ ? = 60
Number System A certain number of two digits is three times the sum of its digits. If 45 be added to it, the digits are reversed. The number is: 24 22 30 27 24 22 30 27 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 27
Number System ?125÷5x ?=6265 153 124 1253 1452 153 124 1253 1452 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 1253
Number System The sum of three consecutive even numbers is 252. What is the sum of the smallest and the largest numbers? 171 170 168 169 171 170 168 169 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 168
Number System If the product of two successive positive integers is 4692, what is the smaller number ? 70 68 66 64 70 68 66 64 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP ∵ 68 x 69 = 4692
Number System A two-digit number is such that the product of the digits is 8. When 18 is added to the number, then the digits are reversed. The number is: 81 18 42 24 81 18 42 24 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the ten's and unit's digit be x and 8/x respectively. Then, (10x + 8/x) + 18 = 10 * 8/x + x 9x2 + 18x - 72 = 0 x2 + 2x - 8 = 0 (x + 4)(x - 2) = 0 x = 2 So, ten's digit = 2 and unit's digit = 4. Hence, required number = 24.
EXAMIANS