SOLUTION: Please help me solve this average questions: 1) Sabrina scored an average of 68 marks for 3 of her Mathematics tests. She wants to pull up her average score to 70 marks. How many

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Question 614414: Please help me solve this average questions:
1) Sabrina scored an average of 68 marks for 3 of her Mathematics tests. She wants to pull up her average score to 70 marks. How many marks does Sabrina need to score for her 4th test?

Answer by richwmiller(9143) About Me  (Show Source):
You can put this solution on YOUR website!
(3*68+x)/4=70
x=76
another way to look at it is
each of the first three missed 70 by 2
3*2=6
70 +6=76