PSLEThe graph shows the mass of a glass when empty and when different combinations of objects R, S and T are placed in the glass.
- What is the mass of the empty glass?
- What is the average mass of the objects R, S and T?
(a)
Mass of the empty glass = 160 g
(b)
Mass of R and T
= 410 - 160
= 250 g
Mass of R and S
= 450 - 160
= 290 g
Mass of S and T
= 460 - 160
= 300 g
(R + T) + (R + S) + (S + T) = 250 + 290 + 300
2 R + 2 S + 2 T = 840
2 x (R + S + T) = 840
R + S + T
= 840 ÷ 2
= 420 g
Average mass of the objects R, S and T
= 420 ÷ 3
= 140 g
Answer(s): (a) 160 g; (b) 140 g