Number System If 70% of an equal to 40% of b, then ratio between a and b is? 4: 7 7: 11 None 7: 4 4: 7 7: 11 None 7: 4 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 70 a = 40 ba: b = 4: 7
Number System If the numerator of a fraction is decreased by 12.5% and the denominator is increased by 180% the resultant fraction is 1/2. What is the original fraction ? 3/5 1/5 8/5 7/5 3/5 1/5 8/5 7/5 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the original fraction be x/y.∴ x x 87.5/100/y x 280/100 = 1/2or 87.5x/280y = 1/2∴ 175x = 280y∴ x/y = 280/175 = 8/5
Number System What is the sum of all the prime numbers from 20 to 40? 118 120 117 119 118 120 117 119 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 23 + 29 + 31 + 37 = 120
Number System In a division sum, the quotient is 120, the divisor 456 and the remainder 333, find the dividend? 55053 56053 5553 50553 55053 56053 5553 50553 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 120 * 456 + 333 = 55053
Number System In how many different ways can the letters of the word TEST' be arranged ? 10 8 16 12 10 8 16 12 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP The word TEST consists of 4 letters in which T comes twice ∴ Number of arrangements= 4!/2! = 4 x 3 x 2 x 1/2 x 1 = 12
Number System What is the sum of 1 + 2 + 3+ ... + 27 ? 396 378 382 343 396 378 382 343 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Sum = 27 x (27 + 1)/2= 27 x 28/2= 27 x 14= 378
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