X = The # of boys.
X+250 = The # of girls
x/(X+250) = 2/7
7x = 2x + 500
5x = 500
X = 100 Boys.
X+250 = 100+250 = 350 Girls.
At a country concert, the ratio of boys to the number of girls is 2:7. If there are 250 more girls than boys, how many boys are at the concert?
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