Number System If (17)3 is subtracted from the square of a number, the answer so obtained is 2143. What is the number ? 83 81 84 82 83 81 84 82 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP x² - (17*17*17) = 2143or x² = 2143 + 4913 = 7056∴ x = 84
Number System If one third of 3/4 of a number is 21. Then find the number? 63 840 630 84 63 840 630 84 ANSWER DOWNLOAD EXAMIANS APP
Number System In how many different ways can the letters of word 'BIOLOGY' be arranged ? 2367 2520 2678 2410 2367 2520 2678 2410 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP In BIOLOGY total 7 letters are there but O comes twice.∴ Number of arrangements = 7!/2! = 2520
Number System The average age of seven boys sitting in a row facing North is 26 years. If the average age of first three boys is 19 years and the average age of last three boys is 32 years, what is the age of the b 31 years 29 years 30 years 28 years 31 years 29 years 30 years 28 years ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Age of the fourth boy = (26 x 7 - 3 x 19 - 3 x 32) years = (182 - 57 - 96) years = 29 years
Number System 432+2170+35=? 494 678 729 523 494 678 729 523 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 494
Number System (12.04 x 7.5 + 0.8 x 45) ÷ 3 = ? 42.1 42.6 45 54.7 42.1 42.6 45 54.7 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP (90.3 + 36) ÷ 3 = 126.3/3 = 42.1
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