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 = 190 g
(b)
Mass of D and F
= 480 - 190
= 290 g
Mass of D and E
= 490 - 190
= 300 g
Mass of E and F
= 440 - 190
= 250 g
(D + F) + (D + E) + (E + F) = 290 + 300 + 250
2 D + 2 E + 2 F = 840
2 x (D + E + F) = 840
D + E + F
= 840 ÷ 2
= 420 g
Average mass of the objects D, E and F
= 420 ÷ 3
= 140 g
Answer(s): (a) 190 g; (b) 140 g