Question
In a 600 ml mixture of alcohol and water, the ratio of
alcohol to water is 3:2. If 200 ml of the mixture is removed and replaced with 50 ml of water, what is the difference between the quantity of water and alcohol in the final mixture?Solution
ATQ, Initial quantity of alcohol: 600 × 3/5 = 360 ml Initial quantity of water: 600−360=240 Quantity of alcohol removed: 200 × 3/5 = 120 ml Quantity of water removed: 200−120=80 ml Alcohol left after removal: 360−120=240 ml Water left after removal: 240−80=160 ml Final quantity of water: 160+50=210 ml Required difference: 240−210=30 ml
A student was supposed to find 2/9 of a number, but he mistakenly found 7/9 of it. His answer came out 150 more than the correct answer. What is the num...
Find the median of 2, 8, 6, 6, 7, 9, 5, 12 and 13.
- Find the median of the following observations:
21, 28, 33, 19, 25, 30, 27 How many 4-digit numbers can be formed from digits 1-6 if repetition not allowed and number is even?
27 percent of a number exceeds 13 percent of the same number by 56. What is the value of the number?
When a number is reduced by 25%, the resulting value is 36 more than 60% of the number's initial value. What is the original number?
Find the least 4-digit number which, when divided by 14, 35, and 20, leaves a remainder of 9 in each case.
Find the remainder when 3¹²⁵ is divided by 13.
The sum of four consecutive even numbers is 108. What is the sum of the squares of these numbers?
How many times I write digit ‘1’ in first hundred natural numbers?