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 = 140 g
(b)
Mass of L and N
= 450 - 140
= 310 g
Mass of L and M
= 470 - 140
= 330 g
Mass of M and N
= 460 - 140
= 320 g
(L + N) + (L + M) + (M + N) = 310 + 330 + 320
2 L + 2 M + 2 N = 960
2 x (L + M + N) = 960
L + M + N
= 960 ÷ 2
= 480 g
Average mass of the objects L, M and N
= 480 ÷ 3
= 160 g
Answer(s): (a) 140 g; (b) 160 g