Question

Can someone explain to me how to solve this problem and answer.... Martin’s average score after 4 tests is 89. What score on the 5th test would bring Martin’s average up to exactly 90?

Answer 1

94

Answer 2

lets see what the problem states; and see if we can make sense of it.

we should be aware of how to find an average; its the sum of the parts divided by how many there are.... right?

Answer 3

(4*89+x)/5 = 90
x=94

Answer 4

\[\frac{sum.of.4.scores}{4}=89\]
\[sum.of.4.scores=89(4)=356\]
\[\frac{356+new.score}{5}=90\]
\[356+new.score=90(5)\]
\[new.score=90(5)-356\]

Answer 5

thank you prashant :)