Number System If 70% of an equal to 40% of b, then ratio between a and b is? 7: 11 4: 7 7: 4 None 7: 11 4: 7 7: 4 None ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 70 a = 40 ba: b = 4: 7
Number System If the difference between a number and two-fifths of that number is 45 what is the number ? 78 77 75 76 78 77 75 76 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the number be x ∴ x - 2x/5 = 45∴ x = 75
Number System Which one of the following is the sum of the numbers 1, 3, 5, 7, 9…. up to nth number? N(N + 1) N2 + 1 N(N + 1)/2 N2 N(N + 1) N2 + 1 N(N + 1)/2 N2 ANSWER DOWNLOAD EXAMIANS APP
Number System The difference between a number and its three-fifth is 50. What is the number? 100 75 None of these 125 100 75 None of these 125 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP x - 3/5 x = 50 => 2/5 x = 50x = (50 * 5)/2 = 125.
Number System The sum of the two numbers is 12 and their product is 35. What is the sum of the reciprocals of these numbers? 12/35 35/8 1/35 7/32 12/35 35/8 1/35 7/32 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the numbers be a and b. Then,a + b = 12 and ab = 35.(a + b)/ab = 12/35= (1/b + 1/a) = 12/35Sum of reciprocals of given numbers = 12/35.
Number System In a five-litre mixture of milk and water the portion of water is 30%. How much milk should be added to the mixture so that the portion of water reduces to 5% ? 25 litre 29 litre 21 litre 17 litre 25 litre 29 litre 21 litre 17 litre ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Original mixture = 5 litre; Milk = 3.5 litre;Water = 1.5 litre Let x litre of milk be added so thatthe mixture becomes (x + 5) litres and the percentage of water becomes 5%So, 1.5 = (x + 5) x 5/10030 = x + 5∴ x = 25 litre
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