Question
A container contains 60 liters of a solution containing
25% alcohol. How many liters of pure alcohol must be added to make the alcohol concentration 40%?Solution
Let x liters of pure alcohol be added to the mixture. Initially, the amount of alcohol in the mixture is 25% of 60 liters, which is 15 liters. After adding x liters of pure alcohol, the total amount of alcohol becomes 15 + x liters, and the total volume of the solution becomes 60 + x liters. The final concentration of alcohol is 40%. We can set up the equation: (15 + x) / (60 + x) = 40/100 = 2/5. Cross-multiply: 5 × (15 + x) = 2 × (60 + x), 75 + 5x = 120 + 2x, 5x - 2x = 120 - 75, 3x = 45, x = 45 / 3 = 15 liters. Correct option: c) 15 liters.
According to the India State Forest Report 2021, which state has shown the highest increase in forest cover?
International labour organization convention 177 was recently seen in the news, is related to?
A shopkeeper sold a laptop after giving two successive discounts of 20% and 5% while making a profit of 30%. Find the approximate...
Auditors use ______ to gather information and determine if they need to conduct substantive testing. Sometimes, they can use analytical methods alone t...
Consider the following statements :
1. Falkland Islands are situated in Pacific Ocean.
2. Red Sea separates Sudan from Egypt.
Ratio of the work done by P, Q and R in one day is 4:2:5 respectively. They all together can complete the work in 35 days. Q and R worked on it for 23 d...
Goods returned by customer will be debited to which account?
How many lines other than those shown in the figure are required to join each corner with another?
Which of the following numbers is divisible by 4?
Which of the following statements is/are incorrect in regards to Green development?
1.At the UNFCCC COP27, Shri Narendra Modi announced Mission L...
Relevant for Exams:
