Number System The average of 7 numbers is 15, that of the first three is 6 and that of the last three is 23. What is the fourth number? 15 13 18 7 15 13 18 7 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 4th No. = (Total of 7 Nos) - (Total of first three + total of last 3) = (15 x 7) - (6 x 3 + 23 x 3) = 105 - (18 + 69) =105 - 87 = 18
Number System In a two-digit number, the digit in unit's place is two more than three times the digit in ten's place. If the sum of the two digits is 10, what is the number ? 28 18 24 22 28 18 24 22 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the number be 10x + y.∴ y = 3x + 2 .......(i)And, x + y = 10 ......(ii)From (i) and (ii), x = 2, y = 8∴ Number = 28
Number System 217 * 217 + 183 * 183 = ? 80578 79698 81268 80698 80578 79698 81268 80698 ANSWER DOWNLOAD EXAMIANS APP
Number System (4 86%of 6500) ÷ 36 =? 677.5 977.5 877.5 777.5 677.5 977.5 877.5 777.5 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 877.5
Number System 17580 x 1.8 - 13720 x 2.1 = ? x 2.4 1120 1140 1160 1180 1120 1140 1160 1180 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 2.4 x ? = 31644 - 28812 = 2832∴ ? = 2832/2.4= 1180
Number System If 1.5 x= 0.04 y, then the value of (y-x) (y+x) is: 73/77 83/77 93/77 77/73 73/77 83/77 93/77 77/73 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 73/77
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