PSLEThe graph shows the mass of a glass when empty and when different combinations of objects F, G and H are placed in the glass.
- What is the mass of the empty glass?
- What is the average mass of the objects F, G and H?
(a)
Mass of the empty glass = 160 g
(b)
Mass of F and H
= 460 - 160
= 300 g
Mass of F and G
= 380 - 160
= 220 g
Mass of G and H
= 480 - 160
= 320 g
(F + H) + (F + G) + (G + H) = 300 + 220 + 320
2 F + 2 G + 2 H = 840
2 x (F + G + H) = 840
F + G + H
= 840 ÷ 2
= 420 g
Average mass of the objects F, G and H
= 420 ÷ 3
= 140 g
Answer(s): (a) 160 g; (b) 140 g