SOLUTION: Johns test scores are 95,90,83. What must he score on his next test to have an average test score of 90 on the four test?

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Question 651340: Johns test scores are 95,90,83. What must he score on his next test to have an average test score of 90 on the four test?
Answer by shweta(56) About Me  (Show Source):
You can put this solution on YOUR website!
John's test scores are 95,90,83 ,x
Average test score in four tests= 90 .
We need to find the score in the fourth test, x
Average, 90= (95+ 90+ 83+x)/4
On cross- multiplication
95+90+83+x= 90*4
268+ x= 360
x= 360-268
x= 92, the score in the fourth test