Me solve ! the math club has 57 members who are in sixth or seventh grades. there are twice as many sixth graders as seventh graders. how many sixth graders are in the club?

We know there is 57 members are in the math club and there is twice as many sixth grades than the seventh. To find out how many sixth graders are in the club, we do:

x = seventh graders
2x = sixth graders

2x + x = 3x

57=3x
57 ÷ 3 = 3x ÷3
19 = x

So there is 19 seventh graders and 19×2= 38 sixth graders