In a group of 60 children, there are twice as many boys as girls. How many girls are there?
If there is twice as many boys then girls, then there are 20 girls because 3x20=60
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\(g-girls\\2g-boys\\\\g+2g=60\\3g=60\ \ \ \ |divide\ both\ sides\ by\ 3\\\boxed{g=20}\leftarrow answer\)