Number System The average age of seven boys sitting in a row facing North is 26 years. If the average age of first three boys is 19 years and the average age of last three boys is 32 years, what is the age of the b 30 years 29 years 28 years 31 years 30 years 29 years 28 years 31 years ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Age of the fourth boy = (26 x 7 - 3 x 19 - 3 x 32) years = (182 - 57 - 96) years = 29 years
Number System When 732 is subtracted form the square of a number, the answer that is obtained is 5280. What is the number? 99 101 103 97 99 101 103 97 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP x2 - 732 = 5280 x2 = 5280 + (70+3)2 = 5280 + 4900 + 420 + 9 = 10609= 10000 + 2(100)(3) + 32 = (100 + 3)2x = 100 + 3 = 103.
Number System Find the number of factors of 300 excluding 1 and itself. 14 16 15 18 14 16 15 18 ANSWER DOWNLOAD EXAMIANS APP
Number System Simplify the 121 * 175 + 363 * 275 None of these 328100 363000 316600 None of these 328100 363000 316600 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 121 * 175 + 363 * 275 => 121 * 175 + 121 * 3 * 275121 * 175 + 121 * 825= 121 * (175 + 825) = 121000
Number System What least number shall be added to 4700 to make it a perfect square ? 91 71 81 61 91 71 81 61 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP (69)² = 4761 and (68)² = 4624Clerly 4624 < 4700 < 4761So 61 should be added to make 4700 a perfect square.
Number System 1827÷ 36 x ?=162.4 2.6 3.2 1.9 4.3 2.6 3.2 1.9 4.3 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 3.2
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