Question

果园里,苹果树比桃树多40棵,桃树的棵树是苹果树的90%,两种树各多少棵?

Answer 1

设苹果树为X,桃树为Y：

X-Y=40

Y=90%X

X=40+90%X

X-90%X=40

X=400 棵

Y=90%*400

=360 棵

所以苹果数是 400棵,桃树是360棵