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 = 180 g
(b)
Mass of F and H
= 420 - 180
= 240 g
Mass of F and G
= 430 - 180
= 250 g
Mass of G and H
= 410 - 180
= 230 g
(F + H) + (F + G) + (G + H) = 240 + 250 + 230
2 F + 2 G + 2 H = 720
2 x (F + G + H) = 720
F + G + H
= 720 ÷ 2
= 360 g
Average mass of the objects F, G and H
= 360 ÷ 3
= 120 g
Answer(s): (a) 180 g; (b) 120 g