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 = 150 g
(b)
Mass of F and H
= 440 - 150
= 290 g
Mass of F and G
= 370 - 150
= 220 g
Mass of G and H
= 420 - 150
= 270 g
(F + H) + (F + G) + (G + H) = 290 + 220 + 270
2 F + 2 G + 2 H = 780
2 x (F + G + H) = 780
F + G + H
= 780 ÷ 2
= 390 g
Average mass of the objects F, G and H
= 390 ÷ 3
= 130 g
Answer(s): (a) 150 g; (b) 130 g