PSLEThe graph shows the mass of a glass when empty and when different combinations of objects J, K and L are placed in the glass.
- What is the mass of the empty glass?
- What is the average mass of the objects J, K and L?
(a)
Mass of the empty glass = 140 g
(b)
Mass of J and L
= 510 - 140
= 370 g
Mass of J and K
= 440 - 140
= 300 g
Mass of K and L
= 430 - 140
= 290 g
(J + L) + (J + K) + (K + L) = 370 + 300 + 290
2 J + 2 K + 2 L = 960
2 x (J + K + L) = 960
J + K + L
= 960 ÷ 2
= 480 g
Average mass of the objects J, K and L
= 480 ÷ 3
= 160 g
Answer(s): (a) 140 g; (b) 160 g