Number System What least number shall be added to 4700 to make it a perfect square ? 71 91 61 81 71 91 61 81 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP (69)² = 4761 and (68)² = 4624Clerly 4624 < 4700 < 4761So 61 should be added to make 4700 a perfect square.
Number System Which one of the following represents the sum of the first n even numbers? N(N – 1) N2+ 1 N2 N(N + 1) N(N – 1) N2+ 1 N2 N(N + 1) ANSWER EXPLANATION DOWNLOAD EXAMIANS APP N (N + 1)
Number System (95.6x 910.3) ÷ 92.56256 = 9? 13.34 14.44 15.54 12.24 13.34 14.44 15.54 12.24 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 13.34
Number System (12)² - (4.4)² - (0.04)² = ? 131.6384 129.6384 125.6384 124.6384 131.6384 129.6384 125.6384 124.6384 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP (12)² - (4.4)² - (0.04)²= 144 - 19.36 - 0.0016= 124.64 - 0.0016= 124.6384
Number System The sum of the digits of a two-digit number is 12, and the difference between the number and the number obtained by interchanging the two digits of the number is 18. Find the number. 12.5 25 75 50 12.5 25 75 50 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the number be 10x + y.∴ x + y = 12 ...........(i)10x + y - (10x + x) = 18or 10x + y - 10y - x = 18or 9x - 9y = 18∴ x - y = 2From (i) and (ii), x = 7, y = 5∴ Number = 75
Number System The sum of three consecutive numbers is 87. The greatest among these three number is: 30 26 29 28 30 26 29 28 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.
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