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 = 100 g
(b)
Mass of G and J
= 340 - 100
= 240 g
Mass of G and H
= 330 - 100
= 230 g
Mass of H and J
= 350 - 100
= 250 g
(G + J) + (G + H) + (H + J) = 240 + 230 + 250
2 G + 2 H + 2 J = 720
2 x (G + H + J) = 720
G + H + J
= 720 ÷ 2
= 360 g
Average mass of the objects G, H and J
= 360 ÷ 3
= 120 g
Answer(s): (a) 100 g; (b) 120 g