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?

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) (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
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