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 = 120 g
(b)
Mass of F and H
= 470 - 120
= 350 g
Mass of F and G
= 420 - 120
= 300 g
Mass of G and H
= 370 - 120
= 250 g
(F + H) + (F + G) + (G + H) = 350 + 300 + 250
2 F + 2 G + 2 H = 900
2 x (F + G + H) = 900
F + G + H
= 900 ÷ 2
= 450 g
Average mass of the objects F, G and H
= 450 ÷ 3
= 150 g
Answer(s): (a) 120 g; (b) 150 g