PSLEThe graph shows the mass of a glass when empty and when different combinations of objects V, W and X are placed in the glass.
- What is the mass of the empty glass?
- What is the average mass of the objects V, W and X?
(a)
Mass of the empty glass = 120 g
(b)
Mass of V and X
= 400 - 120
= 280 g
Mass of V and W
= 430 - 120
= 310 g
Mass of W and X
= 490 - 120
= 370 g
(V + X) + (V + W) + (W + X) = 280 + 310 + 370
2 V + 2 W + 2 X = 960
2 x (V + W + X) = 960
V + W + X
= 960 ÷ 2
= 480 g
Average mass of the objects V, W and X
= 480 ÷ 3
= 160 g
Answer(s): (a) 120 g; (b) 160 g