Edward C. answered 03/10/15
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Let T = number of trout caught
Let B = number of bass caught
They caught 56 more trout than bass ==> T = 56 + B
They caught 72 fish ==> T + B = 72
Substitute the value for T from the 1st equation into the 2nd equation
(56 + B) + B = 72
2*B = 16
B = 8
They caught 8 bass.
To check, find T = 56 + 8 = 64
8 + 64 = 72 fish
64 - 8 = 56 more trout than bass