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- $$35\%$$

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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:
$$12 ÷ 60 = 0.20 = 20\%$$

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