Hi. Please i need help with this question. Workings please.

Find the operation used in solving the question.

Thanks <3

 multiply left and multiply right, then subtract them

Step-by-step explanation:

Sample Left: 6 x 3 - 4 x 3 = x

                               18 - 12 = x

                                    6 = x

Sample: Middle    7 x 4 - 9 x 2 = x

                                 28 - 18 = x

                                         10 = x

Sample: Right       7 x 3 -  0 x 7 = x

                                       21 - 0 = x      

                                             21 = x

if you're trying to figure out how much each ounce cost it would be 0.20

cents each ounce