SOLUTION: ali an average of 50 in 6 tests. what should he get in the next test to attaind the average of 60 ? solve

Question 1025833: ali an average of 50 in 6 tests. what should he get in the next test to attaind the average of 60 ? solve
Found 2 solutions by macston, josmiceli:
Answer by macston(5194) (Show Source): You can put this solution on YOUR website!
.
To average 50 on 6 tests, the current sum of his scores is:
6 x 50 = 300
.
To average 60 on 7 tests, the sum of his scores (desired sum) must be:
7 x 60 = 420
.
desired sum - current sum = needed score
420 - 300 = 120
.
ANSWER: Ali needs to score 120 on the next test to average 60.
.

Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = the grade he should get in the next test
In words,
[ the average score] = [ total of all the scores ] / [ the number of test ]
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The total for the 1st 6 tests is:
[ 6 tests ] x [ average score of 50 ]

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The total score for the 7 tests is:

[ average score of 60 ] = [ total score for 7 tests ] / [ 7 tests ]

He needs a score of 120 in the 7th test to average 60
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