This is the way I do it to find the average.
10 girls times 70 = 700
15 boys times 80= 1200
700+1200=1900 all their scores
1900÷25 (number of boys and girls)=76 or 76%
I think its either A or D
Hope this helps!
19200 all you have to do to figure this out is multiply 100 times 8 since the is 8 halfs in 4 hours.
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