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 = 120 g
(b)
Mass of R and T
= 450 - 120
= 330 g
Mass of R and S
= 460 - 120
= 340 g
Mass of S and T
= 470 - 120
= 350 g
(R + T) + (R + S) + (S + T) = 330 + 340 + 350
2 R + 2 S + 2 T = 1020
2 x (R + S + T) = 1020
R + S + T
= 1020 ÷ 2
= 510 g
Average mass of the objects R, S and T
= 510 ÷ 3
= 170 g
Answer(s): (a) 120 g; (b) 170 g