Number System What is the sum of all the composite numbers up to 20? 128 132 131 130 128 132 131 130 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 4 + 6 + 8 + 9 + 10 + 12 + 14 + 15 + 16 + 18 = 132
Number System 4.78% of 1255 + 3.24% of 440=0.5% of ? 12849 14849 13849 11849 12849 14849 13849 11849 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 0.5 x ?/100 = 4.78 x 1255/100 + 3.24 x 440/100= 59.989 + 14.256∴ ? = 74.245 x 100/0.5 = 14849
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 18 13 7 15 18 13 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 When 732 is subtracted form the square of a number, the answer that is obtained is 5280. What is the number? 103 97 101 99 103 97 101 99 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP x2 - 732 = 5280 x2 = 5280 + (70+3)2 = 5280 + 4900 + 420 + 9 = 10609= 10000 + 2(100)(3) + 32 = (100 + 3)2x = 100 + 3 = 103.
Number System If the difference between a number and its 2/5 is 240, find the number. 440 480 400 360 440 480 400 360 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the no. be x Therefore x - 2x/5 = 240, Therefore, 3x/5 = 240Therefore, x = 240x5/3 = 400
Number System ?2704 x ?2209=? 2444 4444 1444 3444 2444 4444 1444 3444 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 2444
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