PSLEThe graph shows the mass of a glass when empty and when different combinations of objects A, B and C are placed in the glass.
- What is the mass of the empty glass?
- What is the average mass of the objects A, B and C?
(a)
Mass of the empty glass = 170 g
(b)
Mass of A and C
= 400 - 170
= 230 g
Mass of A and B
= 390 - 170
= 220 g
Mass of B and C
= 380 - 170
= 210 g
(A + C) + (A + B) + (B + C) = 230 + 220 + 210
2 A + 2 B + 2 C = 660
2 x (A + B + C) = 660
A + B + C
= 660 ÷ 2
= 330 g
Average mass of the objects A, B and C
= 330 ÷ 3
= 110 g
Answer(s): (a) 170 g; (b) 110 g