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Assume that the letter "a" represents the number of 7th graders.
Since there are twice as many 6th graders we can call them "2a".
There are 57 total members, we can make the following statement:
2a + a = 57
We can simplify this to say 3a = 57.
Divide 57 by 3 = 19. (this is the value of "a")
There are 19 seventh graders and 19 x 2 sixth graders or 38.
38 + 19 = 57