Number System Sum of two numbers is 80. Greater number exceeds by 5 from four times of the smaller. Find the numbers? 64, 16 62, 18 60, 20 65, 15 64, 16 62, 18 60, 20 65, 15 ANSWER DOWNLOAD EXAMIANS APP
Number System Which one of the following represents the sum of the first n even numbers? N2+ 1 N2 N(N – 1) N(N + 1) N2+ 1 N2 N(N – 1) N(N + 1) ANSWER EXPLANATION DOWNLOAD EXAMIANS APP N (N + 1)
Number System The difference between a positive proper fraction and its reciprocal is 9/20. The fraction is: 5/4 3/10 4/5 3/5 5/4 3/10 4/5 3/5 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 1/x - x = 9/20 20x2 + 9x - 20 = 0 20x2 + 25x - 16x - 20 = 0 5x(4x + 5) -4(4x + 5) = 0(4x + 5)(5x - 4) = 0x = 4/5
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 7/5 8/5 3/5 1/5 7/5 8/5 3/5 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 35%of ?=242 693 394 542 487 693 394 542 487 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 693
Number System If (74)² is added to the square of a number the answer so obtained is 7780. What is the number ? 49 50 47 48 49 50 47 48 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the number be x.or, x² + (74)² = 7780or, x² = 7780 - 5476 = 2304∴ x = 48
EXAMIANS