PSLEThe graph shows the mass of a glass when empty and when different combinations of objects G, H and J are placed in the glass.
- What is the mass of the empty glass?
- What is the average mass of the objects G, H and J?
(a)
Mass of the empty glass = 160 g
(b)
Mass of G and J
= 440 - 160
= 280 g
Mass of G and H
= 430 - 160
= 270 g
Mass of H and J
= 510 - 160
= 350 g
(G + J) + (G + H) + (H + J) = 280 + 270 + 350
2 G + 2 H + 2 J = 900
2 x (G + H + J) = 900
G + H + J
= 900 ÷ 2
= 450 g
Average mass of the objects G, H and J
= 450 ÷ 3
= 150 g
Answer(s): (a) 160 g; (b) 150 g