Number System What is the value of ? in the following equations ? 72/? = ?/50 60 40 100 80 60 40 100 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 The product of two consecutive position odd numbers is 6723. What is the smaller number? 74 83 79 71 74 83 79 71 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
Number System 3251 + 587 + 369 - ? = 3007 1375 1250 1200 1300 1375 1250 1200 1300 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let 4207 - x = 3007 Then, x = 4207 - 3007 = 1200
Number System Ratio between two numbers is 3: 4 and their sum is 420. Find the smaller number? 240 140 180 160 240 140 180 160 ANSWER DOWNLOAD EXAMIANS APP
Number System If the numerator of a fraction is decreased by 12.5% and the denominator is increased by 180% the resultant fraction is 1/2. What is the original fraction ? 1/5 3/5 7/5 8/5 1/5 3/5 7/5 8/5 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the original fraction be x/y.∴ x x 87.5/100/y x 280/100 = 1/2or 87.5x/280y = 1/2∴ 175x = 280y∴ x/y = 280/175 = 8/5
Number System Pick the wrong number from the given number series. 3,4,10,33,135,685,4116 10 33 685 135 10 33 685 135 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP The correct number is 136.3 x 1 + 1 = 44 x 2 + 2 = 1010 x 3 + 3 = 3333 x 4 + 4 = 136136 x 5 + 5 = 685685 x 6 + 6 = 4116
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