# Ratio, Proportion and Percentages Puzzle – Challenge 25 Looking for incredibly challenging math and critical thinking puzzle? If so, then this math puzzle is just for you! Let’s challenge your brain!

## Challenge:

20 liters of 40 percent antifreeze in fuel are mixed with 40 liters of 10 percent antifreeze in fuel. The percentage of antifreeze in the new solution is:

A- $$15\%$$

B- $$20\%$$

C- $$25\%$$

D- $$30\%$$

E- $$35\%$$

### The Absolute Best Book to challenge your Smart Student!

The total amount of the mixture of two fuels is 60 liters. (20 liter plus 40 liters) Let’s find the total of the antifreeze.
The sum of $$40\%$$ of 20 liters and $$10\%$$ of 40 liters is:
$$0.40 × 20 + 0.10 × 40 = 8 + 4 = 12$$
Of 60 liters of the mixture, 12 liters are antifreeze. So, the percentage of antifreeze in the new solution is:
$$12 ÷ 60 = 0.20 = 20\%$$ ## How Does It Work? ### 1. Find eBooks

Locate the eBook you wish to purchase by searching for the test or title.  ### 3. Checkout

Complete the quick and easy checkout process. ## Why Buy eBook From Effortlessmath? Save up to 70% compared to print  Help save the environment  Over 2,000 Test Prep titles available Over 80,000 happy customers Over 10,000 reviews with an average rating of 4.5 out of 5  