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
= 500 - 190
= 310 g
Mass of D and E
= 540 - 190
= 350 g
Mass of E and F
= 550 - 190
= 360 g
(D + F) + (D + E) + (E + F) = 310 + 350 + 360
2 D + 2 E + 2 F = 1020
2 x (D + E + F) = 1020
D + E + F
= 1020 ÷ 2
= 510 g
Average mass of the objects D, E and F
= 510 ÷ 3
= 170 g
Answer(s): (a) 190 g; (b) 170 g