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 = 180 g
(b)
Mass of L and N
= 450 - 180
= 270 g
Mass of L and M
= 470 - 180
= 290 g
Mass of M and N
= 400 - 180
= 220 g
(L + N) + (L + M) + (M + N) = 270 + 290 + 220
2 L + 2 M + 2 N = 780
2 x (L + M + N) = 780
L + M + N
= 780 ÷ 2
= 390 g
Average mass of the objects L, M and N
= 390 ÷ 3
= 130 g
Answer(s): (a) 180 g; (b) 130 g