SOLUTION: the average for 12 students grades id 84. when the two lowest grades dropped, the average went up to 90. what is the average of the two lowest grades?

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Question 995570: the average for 12 students grades id 84. when the two lowest grades dropped, the average went up to 90. what is the average of the two lowest grades?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
he average for 12 students grades id 84.
when the two lowest grades dropped, the average went up to 90.
what is the average of the two lowest grades?
:
let x = the Average of the two lowest grades
:
%282x%2B10%2890%29%29%2F12 = 84
Multiply both sides by 12
2x + 900 = 1008
2x = 1008 - 900
2x = 108
x = 108/2
x = 54% is the av of the two lowest grades