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? 13 7 15 18 13 7 15 18 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 Find the number of factors of 300 excluding 1 and itself. 18 15 14 16 18 15 14 16 ANSWER DOWNLOAD EXAMIANS APP
Number System 75% of 250 - ?% of 380 = 54.5 39 31 33 35 39 31 33 35 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 250 x 75/100 - 380 x ?/100 = 54.5= 250 x 75 - 380 x ?= 54.5 x 100= 18750 - 380 x ?= 5450= 380 x? = 18750 - 5450= 13300= ? = 13300/380 = 35
Number System The simplest form of 1.5 : 2.5 is : 17 : 19 5 : 7 3 : 5 13 : 11 17 : 19 5 : 7 3 : 5 13 : 11 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 3 : 5
Number System In how many different ways can the letters of the word ANATOMY be arranged ? 2510 2508 2504 2520 2510 2508 2504 2520 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Here total letters are 7 but A comes twice.Therefore, Numbers of arrangements = 7!/2! = 2520
Number System If the sum and difference of two numbers are 20 and 8 respectively, then the difference of their square is: 160 12 180 28 160 12 180 28 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the numbers be x and y. Then, x + y = 20 and x - y = 8x2 - y2 = (x + y)(x - y) = 20 * 8 = 160.
EXAMIANS