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 31 years 30 years 28 years 29 years 31 years 30 years 28 years 29 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 On multiplying a number by 7, the product is a number each of whose digits is 3. The smallest such number is: 47649 47719 48619 47619 47649 47719 48619 47619 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP By hit and trail, we find that47619 * 7 = 333333.7) 333333 (47619 333333---------------- 0
Number System If the difference between a number and two-fifths of that number is 45 what is the number ? 76 78 77 75 76 78 77 75 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the number be x ∴ x - 2x/5 = 45∴ x = 75
Number System Four-fifth of a number is 10 more than two-third of the same number. What is the number? 91 75 89 35 91 75 89 35 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 75
Number System The difference between a two-digit number and the number obtained by interchanging the digits is 36. What is the difference of the two digits of the number ? 2 4 3 1 2 4 3 1 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP (10x + y) - (10y + x) = 36,9(x - y) = 36/9 = 4
Number System If A = 1, B = 3, C = 5 and so on, what do the numbers 3, 9, 7 stand for BAT CAR CAT BED BAT CAR CAT BED ANSWER EXPLANATION DOWNLOAD EXAMIANS APP BED
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