Number System 432+2170+35=? 729 678 494 523 729 678 494 523 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 494
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? 18 13 15 7 18 13 15 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 The difference between two integers is 5. Their product is 500. Find the numbers. 21, 26 15, 20 30, 25 20, 25 21, 26 15, 20 30, 25 20, 25 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the integers be x and (x + 5). Then, x(x + 5) = 500 x2 + 5x - 500 = 0 (x + 25)(x - 20) = 0 x = 20So, the numbers are 20 and 25.
Number System (3² x 4² x 5) ÷ 36 = (?)² - 80 12 10 16 14 12 10 16 14 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP (?)² = 3² x 4² x 5/36 + 80= 20 + 80 = 100∴ ? = √100 = 10
Number System 4500 * ? = 3375 2/5 1/4 3/4 3/5 2/5 1/4 3/4 3/5 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 4500 * x = 3375= x = 3375/4500 = 3/4
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