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 = 200 g
(b)
Mass of H and K
= 420 - 200
= 220 g
Mass of H and J
= 490 - 200
= 290 g
Mass of J and K
= 470 - 200
= 270 g
(H + K) + (H + J) + (J + K) = 220 + 290 + 270
2 H + 2 J + 2 K = 780
2 x (H + J + K) = 780
H + J + K
= 780 ÷ 2
= 390 g
Average mass of the objects H, J and K
= 390 ÷ 3
= 130 g
Answer(s): (a) 200 g; (b) 130 g