Number System If (35)² is added to the square of a number the answer so obtained is 1394. What is the number ? 15 13 11 17 15 13 11 17 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the number be x Therefore, x² + (35)² = 1394Therefore, x² = 1394 - (35)² = 1394 - 1225 = 169Therefore, x = √169 = 13
Number System In a 150-litre mixture of milk and water, the percentage of milk is 84%. How much water should be added so that the percentage of milk becomes 52.5% ? 90 litre 80 litre 85 litre 95 litre 90 litre 80 litre 85 litre 95 litre ANSWER EXPLANATION DOWNLOAD EXAMIANS APP In 150 litre, milk is 84%ie 150 x 84/100 = 126 litre Let us add x litres of waterTherefore, the quantity of mixture = 150 + x∴ 52.5% of (150 + x) = 126 litres 150 + x = 126x100/52.5 = 240 litres∴ x = 240 - 150 = 90 litres
Number System If a number is subtracted from its square we get 272. Find the number? 14 17 24 22 14 17 24 22 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP x2 – x = 272 => x =17
Number System What is the difference between the largest number and the least number written with the digits 7, 3, 1, 4? 6048 6084 5084 6184 6048 6084 5084 6184 ANSWER DOWNLOAD EXAMIANS APP
Number System The sum of the digits of a two digit number is 12. If the new number formed by reversing the digits is greater than the original number by 54, then what will be the original number? 39 59 49 69 39 59 49 69 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 39
Number System 2/11 of 3/7 of 8/13 of 12012 = ? 321 241 576 449 321 241 576 449 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP ? = 2 x 3 x 8 x 12012/11 x 7 x 13 = 576
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