Number System If (74)² is added to the square of a number the answer so obtained is 7780. What is the number ? 48 47 50 49 48 47 50 49 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the number be x.or, x² + (74)² = 7780or, x² = 7780 - 5476 = 2304∴ x = 48
Number System If 70% of an equal to 40% of b, then ratio between a and b is? None 4: 7 7: 4 7: 11 None 4: 7 7: 4 7: 11 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 70 a = 40 ba: b = 4: 7
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 ? 37/52 31/58 32/51 34/55 37/52 31/58 32/51 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 The sum of the digits of a two digit number is 12. If the new number formed by reversing the digits is greater than the original number by 54, then what will be the original number? 69 59 39 49 69 59 39 49 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 39
Number System 4/6 of 6/5 of 5/7 of a number is 96. Find the number. 170 164 168 162 170 164 168 162 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 Two third of three- fifth of one fourth of a number is 24, what is 30% of that number? 42 90 72 69 42 90 72 69 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP x * 2/3 * 3/5 * 1/4 = 24x = 240240 * 30/100 = 72
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