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Percent and weight question.

One box of cereal contains 25% more than the other.Together they weigh 54 ounces. How much does the cereal weigh in each box? I don't know how to set this up??

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Edward A. | Math Tutor, Retired Computer Scientist and Technical CommunicatorMath Tutor, Retired Computer Scientist a...
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First, identify the quantities involved
let S = weight of smaller box
let L = weight of larger box
 
Next, translate the words into equations relating these quantities:
(one box weighs more than the other)
L = S + .25*S
(together they weigh 54)
L + S = 54
 
Now, it's set up. Substitute the first value for L (S+.25S) into the second equation and solve for S. Then substitute that value for S into either equation and solve for L.