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 = 140 g
(b)
Mass of A and C
= 410 - 140
= 270 g
Mass of A and B
= 420 - 140
= 280 g
Mass of B and C
= 370 - 140
= 230 g
(A + C) + (A + B) + (B + C) = 270 + 280 + 230
2 A + 2 B + 2 C = 780
2 x (A + B + C) = 780
A + B + C
= 780 ÷ 2
= 390 g
Average mass of the objects A, B and C
= 390 ÷ 3
= 130 g
Answer(s): (a) 140 g; (b) 130 g