Posted by lovecaandy on Wednesday, March 23, 2011 at 5:49pm.
Set up a proportion and cross multiply. Let x = the number of boys
3/7 = x/140
7x = 420
x = 60
try (20*4)+(20*3)
there are 80 fourth graders in school of these, 35 were boys. what fractional part of the fourth graders were girls
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