Number System What least number shall be added to 4700 to make it a perfect square ? 61 91 71 81 61 91 71 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 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 ? 8/5 3/5 1/5 7/5 8/5 3/5 1/5 7/5 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 Sum of square of first number and cube of second number together is 568. Also square of the second number is 15 less than square of 8. What is the value of three-fifth of the first number ? 9 7 6 8 9 7 6 8 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the first number be x and the second number be y.∴ y² = 82 - 15 = 64 - 15 = 49∴ y = 7∴ x² + 73 = 568= x² + 343 = 568= x² + 568 - 343 = 225∴ x = √225 = 15∴ 15 x 3/5 = 9
Number System If (47)² is added to the square of a number the answer thus obtained is 2290. What is the number ? 7 8 9 10 7 8 9 10 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the no. be x Therefore, x² + (47)² = 2290Therefore, x² = 2290 - 2209 = 81Therefore, x = 9
Number System Find the least number which when divided by 35 and 11 leaves a remainder of 1 in each case. 388 386 391 384 388 386 391 384 ANSWER DOWNLOAD EXAMIANS APP
Number System What is 50% of 40% of Rs. 3,450? 630 670 690 640 630 670 690 640 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 40% * 3450 = 1380then, 50 % * 1380 = 690
EXAMIANS