#1**+3 **

A little difficult, TB....!!!!

Let a be the amount pumped from tank B into C

And since they all hold the same amount

Amount in B = Amount in A

(150 + n) - a = n - 500

150 - a = -500 add 500, A to both sides

a = 650

And the amount in C = amount in A

500 + 650 = n - 500 add 500 to both sides

1000 + 650 = n

1650 = n

Proof

A contains 1650 - 500 = 1150 after the pumping its amount into C

B contains 150 + 1650 - 650 = 1150 after pumping its amount into C

C contains 500 + 650 = 1150 after receiving oil from A and B

CPhill Mar 2, 2020