PSLEThe graph shows the mass of a glass when empty and when different combinations of objects K, L and M are placed in the glass.
- What is the mass of the empty glass?
- What is the average mass of the objects K, L and M?
(a)
Mass of the empty glass = 110 g
(b)
Mass of K and M
= 400 - 110
= 290 g
Mass of K and L
= 340 - 110
= 230 g
Mass of L and M
= 430 - 110
= 320 g
(K + M) + (K + L) + (L + M) = 290 + 230 + 320
2 K + 2 L + 2 M = 840
2 x (K + L + M) = 840
K + L + M
= 840 ÷ 2
= 420 g
Average mass of the objects K, L and M
= 420 ÷ 3
= 140 g
Answer(s): (a) 110 g; (b) 140 g