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 = 170 g
(b)
Mass of K and M
= 470 - 170
= 300 g
Mass of K and L
= 420 - 170
= 250 g
Mass of L and M
= 520 - 170
= 350 g
(K + M) + (K + L) + (L + M) = 300 + 250 + 350
2 K + 2 L + 2 M = 900
2 x (K + L + M) = 900
K + L + M
= 900 ÷ 2
= 450 g
Average mass of the objects K, L and M
= 450 ÷ 3
= 150 g
Answer(s): (a) 170 g; (b) 150 g