设甲筐苹果有x个
3/8x=（140-x）×1/2
3/8x=70-1/2x
3/8x+1/2x=70
7/8x=70
x=70÷7/8
x=80
乙筐苹果数=140-80=60个
答：甲筐有80个苹果、乙筐有60个苹果