On four exams,Wallace's grades were 79,93,91 and 68. what grade must he obtain on his fifth exam to have an 80 average?

Algebra: Structure And Method, Book 1
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ISBN:9780395977224
Author:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Publisher:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Chapter2: Working With Real Numbers
Section2.4: Subtracting Real Numbers
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On four exams,Wallace's grades were 79,93,91 and 68. what grade must he obtain on his fifth exam to have an 80 average?

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