Number System The sum of two numbers is 25 and their difference is 13. Find their product. 114 104 325 315 114 104 325 315 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the numbers be x and y. Then x + y = 25 and x - y = 13.x = 19; y = 6xy = 19 * 6 = 114
Number System In how many different ways can the letters of the word TEST' be arranged ? 12 8 16 10 12 8 16 10 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP The word TEST consists of 4 letters in which T comes twice ∴ Number of arrangements= 4!/2! = 4 x 3 x 2 x 1/2 x 1 = 12
Number System What is the sum of all the numbers between 300 and 1000 which are divisible by 179? 2527 2607 2506 2517 2527 2607 2506 2517 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 358/179 ….. 895/179179(2 + 3 + 4 + 5) => 2506
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 ? 21 years 18 years 25 years 15 years 21 years 18 years 25 years 15 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 If 1.5 x= 0.04 y, then the value of (y-x) (y+x) is: 73/77 83/77 77/73 93/77 73/77 83/77 77/73 93/77 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 73/77
Number System What number should come in the place of (?) in the following number series ? 1, 4, 9, 25, 49, ?, 169, 289, 361 11 321 225 121 11 321 225 121 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP The series is (Prime No.)²So it is (11)² = 121
EXAMIANS