Number System What is the value of ? in the following equations ? 72/? = ?/50 100 40 60 80 100 40 60 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 3√68921 = ? 21 51 41 31 21 51 41 31 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP ? = 3√68921= 3√41 x 41 x 41= 41
Number System The sum of three consecutive numbers is 87. The greatest among these three number is: 30 28 26 29 30 28 26 29 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the numbers be x, x + 1 and x + 2 Then,x + (x + 1) + (x + 2) = 873x = 84x = 28Greatest number, (x + 2) = 30.
Number System The product of two natural numbers is 17. Then, the sum of the reciprocals of their squares is: 1/289 290/289 289/290 289 1/289 290/289 289/290 289 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the numbers be a and b. Then,ab = 17, a = 1 and b = 17So, 1/a2 + 1/b2 = (a2 + b2)/a2 b2 = (12 + 172)/(1 * 17)2 = 290/289
Number System (12.04 x 7.5 + 0.8 x 45) ÷ 3 = ? 54.7 42.1 42.6 45 54.7 42.1 42.6 45 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP (90.3 + 36) ÷ 3 = 126.3/3 = 42.1
Number System √343 = ? 19 20 18 21 19 20 18 21 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP ? = √343 = 18
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