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 = 100 g
(b)
Mass of K and M
= 430 - 100
= 330 g
Mass of K and L
= 440 - 100
= 340 g
Mass of L and M
= 390 - 100
= 290 g
(K + M) + (K + L) + (L + M) = 330 + 340 + 290
2 K + 2 L + 2 M = 960
2 x (K + L + M) = 960
K + L + M
= 960 ÷ 2
= 480 g
Average mass of the objects K, L and M
= 480 ÷ 3
= 160 g
Answer(s): (a) 100 g; (b) 160 g