The weight of the math and the history book are 72 and 96 ounces respectively.
A history book weights 24 oz more than a math book.
Therefore,
let
x = weight of math book
weight of history book = 24 + x
The math book is 75% the weight of the history book.
Therefore,
math book weight = 75 / 100 (24 + x)
x = 75 / 100 (24 + x)
x = 1800 + 75x / 100
100x = 1800 + 75x
100x - 75x = 1800
25x = 1800
x = 1800 / 25
x = 72
Therefore,
weight of math book = 72 ounces
weight of history book = 72 + 24 = 96 ounces.
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