Xiao Ming and I have collected 120 stamps. The number of stamps I collected is 3 / 7 of Xiao Ming's. how many stamps have Xiao Ming and Xiao Li collected? It's an equation!

Let X be the number of Xiaoming and y be the number of Xiaoli
120=X+X*3/7
120=X(1+3/7)
X=120/(1+3/7)
X=84
120=X+Y
Y=120-X
Y=36

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