Suppose 2 eggs with bacon cost 2.70. One egg with bacon costs 1.80. At thesebrates what will bacon alone cost

If 2 eggs with bacon cost 2.70, and 1 egg with bacon costs 1.80, that means that 1 egg costs 0.90, so when we subtract once more 0.90 we get the price of the bacon alone, which is in this case 0.90.