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 = 120 g
(b)
Mass of A and C
= 360 - 120
= 240 g
Mass of A and B
= 430 - 120
= 310 g
Mass of B and C
= 410 - 120
= 290 g
(A + C) + (A + B) + (B + C) = 240 + 310 + 290
2 A + 2 B + 2 C = 840
2 x (A + B + C) = 840
A + B + C
= 840 ÷ 2
= 420 g
Average mass of the objects A, B and C
= 420 ÷ 3
= 140 g
Answer(s): (a) 120 g; (b) 140 g