Number System If 1.5 x= 0.04 y, then the value of (y-x) (y+x) is: 93/77 73/77 83/77 77/73 93/77 73/77 83/77 77/73 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 73/77
Number System 64% of 2650+40% 0f 320=? 1578 1824 2096 1247 1578 1824 2096 1247 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 1824
Number System If one-seventh of a number is 55 then 40% of that number = ? 154 163 171 147 154 163 171 147 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the no. be x , Therefore, x/7 = 55Therefore, x = 55 x 7 = 385Therefore, 49% of 385 = 154
Number System If x + y = 61 and xy = 888, What is the value of x²+ y² ? 1965 1975 1945 1955 1965 1975 1945 1955 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Because (x + y)² = x² + y² + 2xy∴ x² + y² = (x + y)² - 2xy∴ x² + y² = (61)² - 2 x 888= 3721 - 1776 = 1945
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 ? 32/51 34/55 37/52 31/58 32/51 34/55 37/52 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 In how many ways can 5 boys be chosen from 6 boys and 4 girls so as to include exactly one girl ? 54 60 58 56 54 60 58 56 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP One girl can be chosen in 4C1 = 4 ways and 4 boys can be chosen in 6C4 = 15 ways ∴ Total number of ways = 4 x 15 = 60 ways.
EXAMIANS