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 = 180 g
(b)
Mass of A and C
= 530 - 180
= 350 g
Mass of A and B
= 480 - 180
= 300 g
Mass of B and C
= 430 - 180
= 250 g
(A + C) + (A + B) + (B + C) = 350 + 300 + 250
2 A + 2 B + 2 C = 900
2 x (A + B + C) = 900
A + B + C
= 900 ÷ 2
= 450 g
Average mass of the objects A, B and C
= 450 ÷ 3
= 150 g
Answer(s): (a) 180 g; (b) 150 g