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 = 140 g
(b)
Mass of G and J
= 520 - 140
= 380 g
Mass of G and H
= 450 - 140
= 310 g
Mass of H and J
= 470 - 140
= 330 g
(G + J) + (G + H) + (H + J) = 380 + 310 + 330
2 G + 2 H + 2 J = 1020
2 x (G + H + J) = 1020
G + H + J
= 1020 ÷ 2
= 510 g
Average mass of the objects G, H and J
= 510 ÷ 3
= 170 g
Answer(s): (a) 140 g; (b) 170 g