SOLUTION: 5/6 of 15 gallons = 12 1/2. How do you work the problem to get answer?

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Question 774892: 5/6 of 15 gallons = 12 1/2. How do you work the problem to get answer?
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
Essentially cut the 15 gallons into 6 equal parts (meaning division by 6) and then count 5 of those parts.

This way:
%285%2F6%29%2A15

%285%2F%282%2A3%29%29%283%2A5%29

%285%2A3%2A5%29%2F%282%2A3%29

%285%2Across%283%29%2A5%29%2F%282%2Across%283%29%29

%285%2A5%29%2F2

25%2F2