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 = 170 g
(b)
Mass of C and E
= 420 - 170
= 250 g
Mass of C and D
= 410 - 170
= 240 g
Mass of D and E
= 400 - 170
= 230 g
(C + E) + (C + D) + (D + E) = 250 + 240 + 230
2 C + 2 D + 2 E = 720
2 x (C + D + E) = 720
C + D + E
= 720 ÷ 2
= 360 g
Average mass of the objects C, D and E
= 360 ÷ 3
= 120 g
Answer(s): (a) 170 g; (b) 120 g