Number System Find the least value of 3x + 4y if x2y3 = 6. 7 10 6 3 7 10 6 3 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 10
Number System 6.4 x 8.5 x 25/3.2 x 12.5 = ? 2.3 4.5 3.4 5.6 2.3 4.5 3.4 5.6 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP ? = 6.4 x 8.5 x 2.5/3.2 x 12.5 = 3.4
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 37/52 31/58 34/55 32/51 37/52 31/58 34/55 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 numberator of a fraction is increased by 50% and denominator by 20% the fraction become 9/15. What was the original fraction ? 12/25 3/5 13/25 6/7 12/25 3/5 13/25 6/7 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the fraction be x/yWe have 150x/120y = 9/15= x/y = 12/25
Number System If the difference between a number and its three-fourth is 18, find the number. 72 68 57 61 72 68 57 61 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the number be x.According to the question,x - 3x/4 = 18= x/4 = 18= x = 4 x 18 = 72
Number System The difference between 72% of a number and 49% of the same number is 575. What is 9% of that number ? 295 225 275 245 295 225 275 245 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
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