PSLEThe graph shows the mass of a glass when empty and when different combinations of objects H, J and K are placed in the glass.
- What is the mass of the empty glass?
- What is the average mass of the objects H, J and K?
(a)
Mass of the empty glass = 110 g
(b)
Mass of H and K
= 470 - 110
= 360 g
Mass of H and J
= 480 - 110
= 370 g
Mass of J and K
= 460 - 110
= 350 g
(H + K) + (H + J) + (J + K) = 360 + 370 + 350
2 H + 2 J + 2 K = 1080
2 x (H + J + K) = 1080
H + J + K
= 1080 ÷ 2
= 540 g
Average mass of the objects H, J and K
= 540 ÷ 3
= 180 g
Answer(s): (a) 110 g; (b) 180 g