A. To answer this item, we let x be the number of aluminum cans and y be the number of plastic bottles. With this representation, the total money that is gained from the sales is 0.10x and 0.05y. The equation then becomes,
0.10x + 0.05y = 500
B. If the value of y is 6000 then,
0.10x + 0.05(6000) = 500
The value of x is 2000.