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 = 150 g
(b)
Mass of D and F
= 500 - 150
= 350 g
Mass of D and E
= 450 - 150
= 300 g
Mass of E and F
= 460 - 150
= 310 g
(D + F) + (D + E) + (E + F) = 350 + 300 + 310
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) 150 g; (b) 160 g