Question 735601: A class of 19 students had an average on a mathematics test of 90 points. The 12 girls in the class scored 1,317 points. How many points did the 7 boys score?
Found 3 solutions by lynnlo, MathTherapy, ikleyn:
Answer by lynnlo(4176)   (Show Source):
Answer by MathTherapy(10579)  (Show Source):
You can put this solution on YOUR website!
A class of 19 students had an average on a mathematics test of 90 points. The 12 girls in the class scored 1,317 points. How many points did the 7 boys score?
Since there were 19 students, then total amount of points scored = 19 * 90, or 1,710
Since the girls scored 1,317 of the 1,710 points, then the boys scored 1,710 – 1,317, or  points.
Answer by ikleyn(53339)  (Show Source):
You can put this solution on YOUR website! .
A class of 19 students had an average on a mathematics test of 90 points.
The 12 girls in the class scored 1,317 points. How many points did the 7 boys score?
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The 7 boys did 19*90 - 1317 = 393 scores. ANSWER
Ignore the post by @lynnlo, since it is FATALLY WRONG.
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