Number System If the sum and difference of two numbers are 20 and 8 respectively, then the difference of their square is: 28 12 180 160 28 12 180 160 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the numbers be x and y. Then, x + y = 20 and x - y = 8x2 - y2 = (x + y)(x - y) = 20 * 8 = 160.
Number System The average of 7 consecutive even numbers A, B, C, D, E, F and G is 36. What is the product of ' C and 'E' ? 1292 1468 1168 1327 1292 1468 1168 1327 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP A + B + C + D + E + F + G/7 = 36Therefore, D = 36Therefore, C = 34, E = 38Therefore, Product = 34 x 38 = 1292
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 ? 17 years 19 years 18 years 20 years 17 years 19 years 18 years 20 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 The Twenty-First Century will start on January 1 in the year 2101 2000 2001 2100 2101 2000 2001 2100 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 2001
Number System Find the least number with which 16200 should be multiplied, to make it a perfect cube. 45 36 48 360 45 36 48 360 ANSWER DOWNLOAD EXAMIANS APP
Number System Sum of two numbers is 15. Two times of the first exceeds by 5 from the three times of the other. Then the numbers will be? 10, 5 9, 6 7, 8 6, 9 10, 5 9, 6 7, 8 6, 9 ANSWER DOWNLOAD EXAMIANS APP
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