SOLUTION: The average mark on the first 3 tests Jean took was 76. What average mark does Jean need on the next two tests to have an average of 80 for all of the tests?
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Question 292454: The average mark on the first 3 tests Jean took was 76. What average mark does Jean need on the next two tests to have an average of 80 for all of the tests? Answer by ankor@dixie-net.com(22740) (Show Source):
You can put this solution on YOUR website! The average mark on the first 3 tests Jean took was 76.
What average mark does Jean need on the next two tests to have an average
of 80 for all of the tests?
:
Let x = value required on the last two tests to average an 80 for all 5 tests
: = 80
Multiply both sides by 5
228 + 2x = 5(80)
2x = 400 - 228
2x = 172
x =
x = 86 the average required on the last two tests.
