Question 5
There are five standard weights A, B, C, D and E. Given the weight A and the weight B weigh 7 pounds in total, the weight B and weight C weigh 9 pounds in total, the weight C and weight D weigh 11 pounds in total, the weight D and weight E weigh 8 pounds in total, and the weight A, C and E weigh 10 pounds in total. How many pounds do all five weights weigh?