SOLUTION: There are 100 potatoes spread over three bins in a supermarket. A total of 35 potatoes are in bins A and B. A total of 75 potatoes are in bins B and C. How many potatoes are in

Write as you read


    A + B + C = 100     (1)

    A + B     =  35     (2)

        B + C =  75.    (3)


From equation (1), subtract equation (2).  You will get  C = 100-35 = 65.


From equation (1), subtract equation (3).  You will get  A = 100-75 = 25.


Now from equation (1)

    B = 100 - A - C = 100 - 25 - 65 = 10.


ANSWER.  25 potatoes in bin A;  10 potatoes in bin B;  65 potatoes in bin C.