Number System If one third of 3/4 of a number is 21. Then find the number? 840 63 630 84 840 63 630 84 ANSWER DOWNLOAD EXAMIANS APP
Number System What is the sum of all the prime numbers from 20 to 40? 119 117 120 118 119 117 120 118 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 23 + 29 + 31 + 37 = 120
Number System If a + b = 16 and ab = 68, what is the value of a² + b² ? 124 120 116 112 124 120 116 112 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP a + b = 16 Therefore, (a+b)² = (16)² = 256 a² + b² + 2ab = 256Therefore, a² + b² = 256 - 2 x 68Therefore, a² + b² = 256 - 136 = 120
Number System (2560 x 1.4) +(7400 x 0.6) =? 6543 9160 8024 7234 6543 9160 8024 7234 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 8024
Number System 7.8 x 4.5 x 4.2/0.14 = ? 1053 1032 1087 1012 1053 1032 1087 1012 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 7.8 x 4.5 x 4.2/0.14 = 1053
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 17 litre 21 litre 29 litre 25 litre 17 litre 21 litre 29 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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