Number System If A + B = 30 and AB = 94, What is the value of A² + B² ? 712 625 824 920 712 625 824 920 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP (A + B)² = (30)² = 900A² + B² + 2AB = 900Therefore, A² + B² = 900 - 2 x 94 = 900 - 188 = 712
Number System 84 * 29 + 365 = ? 2436 2801 - 2801 - 2071 2436 2801 - 2801 - 2071 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP - 84 * (30 - 1) + 365= - (84 * 30) + 84 + 365= - 2520 + 449 = - 2071
Number System Find the number of factors of 300 excluding 1 and itself. 15 14 18 16 15 14 18 16 ANSWER DOWNLOAD EXAMIANS APP
Number System The sum of the present age of a father and a son is 60 years. Five years before, the age of the father was four times that of son. What is the present age of the son ? 15 years 21 years 18 years 25 years 15 years 21 years 18 years 25 years ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the father's age be x and son's age yTherefore, x + y = 60 ....................(i)Five years back, (x - 5) = 4 (y - 5)x - 4y = - 15 ......................(2)Solving (1) and (2), x = 45 and y = 15
Number System A certain number of two digits is three times the sum of its digits. If 45 be added to it, the digits are reversed. The number is: 22 30 24 27 22 30 24 27 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 27
Number System The Twenty-First Century will start on January 1 in the year 2100 2101 2000 2001 2100 2101 2000 2001 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 2001
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