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 = 130 g
(b)
Mass of C and E
= 390 - 130
= 260 g
Mass of C and D
= 430 - 130
= 300 g
Mass of D and E
= 410 - 130
= 280 g
(C + E) + (C + D) + (D + E) = 260 + 300 + 280
2 C + 2 D + 2 E = 840
2 x (C + D + E) = 840
C + D + E
= 840 ÷ 2
= 420 g
Average mass of the objects C, D and E
= 420 ÷ 3
= 140 g
Answer(s): (a) 130 g; (b) 140 g