SOLUTION: what is the percentage of the combination of 8 gallons of 17% mix with 12 gallons of 40% mix?

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Question 1100532: what is the percentage of the combination of 8 gallons of 17% mix with 12 gallons of 40% mix?
Found 2 solutions by Fombitz, josgarithmetic:
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
8%2A%2817%2F100%29%2B12%2840%2F100%29=6.16 gallons of mix.
8%2B12=20 total gallons
So,
6.16%2F20=.308
30.8%

Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
straightforward percentage calculation

%288%2A17%2B12%2A40%29%2F%288%2B12%29percent