Question 1025833
.
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.
.