Number System The difference between 72% of a number and 49% of the same number is 575. What is 9% of that number ? 245 225 295 275 245 225 295 275 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the no. be x.Therefore, 72% of x - 49% of x = 575Therefore, (72 - 49)% of x = 575Therefore, 9% of x = 575/23 x 9 = 225
Number System A basket contains 5 blue, 4 green and 3 red ball. If three balls are picked at random, what is the probability that at least one is red ? 34/55 37/52 32/51 31/58 34/55 37/52 32/51 31/58 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Probability of having no red ball is9C3 / 12C3 = 21/55Probability of having at least one red ball is 1 - 21/55 = 34/55
Number System If the sum of four consecutive numbers is 370, which the following is the third lowest number among them 90 89 92 91 90 89 92 91 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the four consecutive numbers be x, (x + 1), (x + 2), (x + 3) thenx + (x + 1) + (x + 2) + (x + 3) = 370= 4x + 6 = 370∴ x = 364/4 = 91∴ third lowest number among them = x + 1= 91 + 1 = 92
Number System Two-third of a positive number and 25/216 of its reciprocal are equal. The number is: 12/5 5/12 25/144 144/25 12/5 5/12 25/144 144/25 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the number be x. Then,2/3 x = 25/216 * 1/xx2 = 25/216 * 3/2 = 25/144 x = 5/12
Number System 4/6 of 6/5 of 5/7 of a number is 96. Find the number. 170 168 162 164 170 168 162 164 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the number be x.∴ x x 4/6 x 6/5 x 5/7 = 96∴ x = 96 x 6 x 5 x 7/4 x 6 x 5 = 168
Number System How many numbers up to 300 and 700 are divisible by 2, 3 and 7 both together? 10 9 11 8 10 9 11 8 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP (700 – 300)/42 = 9 22/42 => 9 Numbers
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