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 = 150 g
(b)
Mass of H and K
= 490 - 150
= 340 g
Mass of H and J
= 450 - 150
= 300 g
Mass of J and K
= 470 - 150
= 320 g
(H + K) + (H + J) + (J + K) = 340 + 300 + 320
2 H + 2 J + 2 K = 960
2 x (H + J + K) = 960
H + J + K
= 960 ÷ 2
= 480 g
Average mass of the objects H, J and K
= 480 ÷ 3
= 160 g
Answer(s): (a) 150 g; (b) 160 g