ACS Primary 2010 SA1 Math Paper 2 Q9

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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