Question

The scores of Tim’s first four math tests are 82%, 90%, 78%, and 100%. If Tim wants to have a test average of 90%, what must the average of Tim’s next two tests be?
(A) 90% (B) 92% (C) 95% (D) 97% (E) 100%

Answer 1

@UditKulka @nincompoop @kayla_b_stephens

Answer 2

the average so far is
(82 + 90 + 77 + 100) / 4

Answer 3

87.5 % (i did use 78% for this result, typo above)

Answer 4

so we need (87.5% + next_average ) / 2 =90%

Answer 5

um @UditKulka can u please just give the link to the place ur taking the answer

Answer 6

because i think steeling someone else's work is plagiarism

Answer 7

here is the link :)

http://openstudy.com/study#/updates/5246ece6e4b034054f3dd000

Answer 8

90% is half of 180%
Is this like 87.5%+92.5=180
180/2=90

Answer 9

Will the answer be 92%?

Answer 10

How many tests did he sit for?

Answer 11

He took four tests so far.

Answer 12

Each of them were out of 100 right?

Answer 13

Yes

Answer 14

So average in 4 tests is
(82 + 90 + 77 + 100) / 4

Answer 15

right?

Answer 16

I followed your method of adding 82%+90%+78%+100%=350% and then divided 350/4=87.5

However, I since he is taking another two tests after the four test, that means that it will be 6 tests altogether. To finding out the full percentage he needs I set up this equation of 90(6)6=540.

Then subtracted 540-350=190.

Since there will be two tests, I did 190/2=95%.

I checked the answer key, it was 95%.

Answer 17

yes sorry my bad

Answer 18

No problem. I appreciate it when people at least try to help others.