Number System If 70% of an equal to 40% of b, then ratio between a and b is? None 7: 4 4: 7 7: 11 None 7: 4 4: 7 7: 11 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 70 a = 40 ba: b = 4: 7
Number System If (83)² is subtracted from the square of a number, the answer so obtained is 8487. What is the number ? 179 124 146 163 179 124 146 163 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the number be x Therefore, x² - (83)² = 8487x² = 8487 + (83)²x² = 8487 + 6889x² = 15376Therefore, x² = 15376 x = 124
Number System The Twenty-First Century will start on January 1 in the year 2101 2001 2000 2100 2101 2001 2000 2100 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 2001
Number System The product of two natural numbers is 17. Then, the sum of the reciprocals of their squares is: 1/289 289/290 289 290/289 1/289 289/290 289 290/289 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 Two numbers are in the ratio 3:5. If 9 be subtracted from each, they are in the ratio of 9:17. The first number is: 36 30 27 18 36 30 27 18 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP (3x-9):(5x-9) = 9:17 x = 12 => 3x = 36
Number System Write the next number in the series : 14, 16, 13, 17, 12, 18, 11 .... 1 15 7 19 1 15 7 19 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 19
EXAMIANS