Number System If (72)² is subtracted from the square of a number, the answer thus obtained is 4617. What is the number ? 95 99 103 92 95 99 103 92 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP x² - (72)² = 467Therefore, x² = 4617 + 5184Therefore, x² = 9801 Therefore, x = 99
Number System 2/11 of 3/7 of 8/13 of 12012 = ? 321 576 449 241 321 576 449 241 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP ? = 2 x 3 x 8 x 12012/11 x 7 x 13 = 576
Number System Which one of the following represents the sum of the first n even numbers? N2+ 1 N2 N(N + 1) N(N – 1) N2+ 1 N2 N(N + 1) N(N – 1) ANSWER EXPLANATION DOWNLOAD EXAMIANS APP N (N + 1)
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 7 15 13 18 7 15 13 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 35% of a number and 18% of the same number is 93.5 then what is the 40% of that number ? 225 232 220 245 225 232 220 245 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Diff = (35 - 18)% of x = 93.517x/100 = 93.5Therefore, x = 550Therefore, 40% of 550 = 220
Number System In how many different ways can the letters of the word "MOBILIZE" be arranged ? 18456 19765 20160 17453 18456 19765 20160 17453 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP The word MOBILIZE has eight letters in which I comes twice ∴ Number of arrangements = 8!/2! = 20160
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