Question

How many quarts of pute antifreeze must be added to 3 quarts of a 20% antifreeze solution to obtain a 40% antifreeze solution

Answer 1

Answer: 0.6

Explanation: I am going to break them into steps, so that you can understand them more clearly.

Step 1: Find how much the amount of water is needed:

0.4(3 quarts + x quarts) = (0.6 quarts + x)

Step 2: Find how much the quarts is divided by 0.6:

1.2 + 0.4x = 0.6 + x

Step 3: each quart is equal to 1 therefore:

x = 1 quart - which is 0.6

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