PSLEThe graph shows the mass of a glass when empty and when different combinations of objects L, M and N are placed in the glass.
- What is the mass of the empty glass?
- What is the average mass of the objects L, M and N?
(a)
Mass of the empty glass = 200 g
(b)
Mass of L and N
= 500 - 200
= 300 g
Mass of L and M
= 450 - 200
= 250 g
Mass of M and N
= 490 - 200
= 290 g
(L + N) + (L + M) + (M + N) = 300 + 250 + 290
2 L + 2 M + 2 N = 840
2 x (L + M + N) = 840
L + M + N
= 840 ÷ 2
= 420 g
Average mass of the objects L, M and N
= 420 ÷ 3
= 140 g
Answer(s): (a) 200 g; (b) 140 g