**The graph below shows the mass of a container when it is empty and when different combinations of objects X, Y and Z are placed in it. **

**Solution**

Empty container --> 80g

Y + Z ----- 140g - 80g = 60g

X + Z ----- 300g - 80g = 220g

X + Y ----- 340 g - 80g = 260g

Total of all objects

----- 60g + 220g + 260g = 540g

Average ----- 540g divided by 6 = 90g

**Answer: 90g**

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