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 = 130 g
(b)
Mass of F and H
= 360 - 130
= 230 g
Mass of F and G
= 340 - 130
= 210 g
Mass of G and H
= 350 - 130
= 220 g
(F + H) + (F + G) + (G + H) = 230 + 210 + 220
2 F + 2 G + 2 H = 660
2 x (F + G + H) = 660
F + G + H
= 660 ÷ 2
= 330 g
Average mass of the objects F, G and H
= 330 ÷ 3
= 110 g
Answer(s): (a) 130 g; (b) 110 g