You have 5 bales of hay. and they were weighed but they didn't weigh them individually, they were weighed in pairs. The pairs were 1&2, 1&3, 1&4, 1&5, 2&3, 2&4, 2&5, and so on. The weights of the pairs were 80,82,83,84,85,86,87,88,90, and 91. Can you tell me how much the bales weigh individually.

Please help me.
Thank

Hi Thien
The data is inconsistant. The weight of bale 1 should be (1&2 + 1&3 - 2&3)/2 = (80 + 82 - 85)/2 = 77/2, but also (1&4 + 1&5 - 4&5)/2 = (83 + 84 - 91)/2 = 77.