PSLEThe graph shows the mass of a glass when empty and when different combinations of objects D, E and F are placed in the glass.
- What is the mass of the empty glass?
- What is the average mass of the objects D, E and F?
(a)
Mass of the empty glass = 180 g
(b)
Mass of D and F
= 460 - 180
= 280 g
Mass of D and E
= 540 - 180
= 360 g
Mass of E and F
= 500 - 180
= 320 g
(D + F) + (D + E) + (E + F) = 280 + 360 + 320
2 D + 2 E + 2 F = 960
2 x (D + E + F) = 960
D + E + F
= 960 ÷ 2
= 480 g
Average mass of the objects D, E and F
= 480 ÷ 3
= 160 g
Answer(s): (a) 180 g; (b) 160 g