Number System If the numberator of a fraction is increased by 50% and denominator by 20% the fraction become 9/15. What was the original fraction ? 12/25 13/25 6/7 3/5 12/25 13/25 6/7 3/5 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the fraction be x/yWe have 150x/120y = 9/15= x/y = 12/25
Number System A bag contains four red, six black and seven green balls. Three balls are drawn randomly. What is the probability that the balls drawn contain exactly two red balls ? 39/340 58/340 51/340 45/340 39/340 58/340 51/340 45/340 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Total balls = 4 + 6 + 7 = 17∴ n(S) = 17C1 = 680Two red balls can be selected from four red balls in 4C2 = 6 ways.and the third ball can be selected from the remaining 13 balls in 13C1 = 13 ways.∴ P (E) = 13x6/680 = 39/340
Number System If a number is multiplied by. three-fourth of itself, the value thus obtained is 10800. What is that number ? 60 180 260 120 60 180 260 120 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the number be x.∴ x x 3x/4 = 10800= x² = 10800 x 4/3 = 14400∴ x = √14400 = 120
Number System (444 x 44 x 4) ÷ 40 ? 2153.6 2053.6 1853.6 1953.6 2153.6 2053.6 1853.6 1953.6 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP ? = 444 x 44 x 4/40 = 1953.6
Number System 384×12×2=? 6123 9216 8465 7487 6123 9216 8465 7487 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 9216
Number System 732.96 + 405.38 - 604.08 - 105.44 + 222.86 = ? 631.68 621.68 651.68 641.68 631.68 621.68 651.68 641.68 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP ? = 1361.20 - 709.52 = 651.68
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