This is yet another problem on the sample 7th grade EOG test.

Shana and Mina are workign on a math project and will receive the same grade. Their individual grades before the project are listed below.

What grade could they receive that will keep Shana's average the same, but improve Mina's average by one point?

A) 83

B) 85

C) 87

D) 90

I worked this problem last night and I got D) 90, but I had to go thru all the possible answers before I got to the right answer. My question is, is there any short cut, or this the only way to solve a problem like this?

Shana and Mina are workign on a math project and will receive the same grade. Their individual grades before the project are listed below.

What grade could they receive that will keep Shana's average the same, but improve Mina's average by one point?

A) 83

B) 85

C) 87

D) 90

I worked this problem last night and I got D) 90, but I had to go thru all the possible answers before I got to the right answer. My question is, is there any short cut, or this the only way to solve a problem like this?

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