Number System The sum of two numbers is 165 and the difference between them is 9. What is the average of these two numbers ? 82.5 85.5 84.5 83.5 82.5 85.5 84.5 83.5 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP x + y = 165x - y = 92x = 174 ∴ x = 87 and y = 78∴ x + y/2 = 165/2 = 82.5
Number System The sum of the ages of a son and father is 65 years. After 5 years the age of father will be double of the age of son. What is the age of son ? 20 years 18 years 19 years 17 years 20 years 18 years 19 years 17 years ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the age of the son be x and the age of the father be y.Therefore, x + y = 65 ..........(i)or, 2 x (x + 5) = (y + 5)or, 2x + 10 = y + 5or, 2x - y = 5 ...................(ii)From equations (i) and (ii), x = 20, y = 45
Number System If the product of two successive positive integers is 4692, what is the smaller number ? 64 66 70 68 64 66 70 68 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP ∵ 68 x 69 = 4692
Number System 432+2170+35=? 678 494 729 523 678 494 729 523 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 494
Number System Of the three numbers, second is twice the first and is also thrice the third. If the average of the three numbers is 44, the largest number is 44 72 56 38 44 72 56 38 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 72
Number System What is the least number, which is perfect square but contains 2700 as its factor? 2700 10800 5400 1800 2700 10800 5400 1800 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 900 * 3 * 3 = 8100
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