Each package weighs 64 lb
each package contains 4 boxes
64lb= 4 boxes
Then:
Each box contains a 7lb of bags of beans and 1 bag of rise
4 (x+ 7)
x= weight of each bag of rise
64 = 4 (x + 7)
Solve for x
64 = 4x + 28
64-28 =4x
36 = 4x
36/4 = x
9=x
Each bag of rice weighs 9 lb