PSLEThe graph shows the mass of a glass when empty and when different combinations of objects C, D and E are placed in the glass.
- What is the mass of the empty glass?
- What is the average mass of the objects C, D and E?
(a)
Mass of the empty glass = 180 g
(b)
Mass of C and E
= 470 - 180
= 290 g
Mass of C and D
= 510 - 180
= 330 g
Mass of D and E
= 460 - 180
= 280 g
(C + E) + (C + D) + (D + E) = 290 + 330 + 280
2 C + 2 D + 2 E = 900
2 x (C + D + E) = 900
C + D + E
= 900 ÷ 2
= 450 g
Average mass of the objects C, D and E
= 450 ÷ 3
= 150 g
Answer(s): (a) 180 g; (b) 150 g