SOLUTION: Jerome's score on four tests are 89,71, 87 and 75. What must his score on the next test be so that his average will be 82?

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Question 762293: Jerome's score on four tests are 89,71, 87 and 75. What must his score on the next test be so that his average will be 82?
Answer by 2897696(96) About Me  (Show Source):
You can put this solution on YOUR website!
Average: when you add number together and divide the sum by the total of numbers added.
let x = unknown test%
==>add all test% including the unknown/by number of test add= to the average wanted
Equation:
(89+71+87+75+x)/5=82
Solve for x
322+x=410
x=78%
So the test score needed is 78%.