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 = 110 g
(b)
Mass of L and N
= 400 - 110
= 290 g
Mass of L and M
= 410 - 110
= 300 g
Mass of M and N
= 420 - 110
= 310 g
(L + N) + (L + M) + (M + N) = 290 + 300 + 310
2 L + 2 M + 2 N = 900
2 x (L + M + N) = 900
L + M + N
= 900 ÷ 2
= 450 g
Average mass of the objects L, M and N
= 450 ÷ 3
= 150 g
Answer(s): (a) 110 g; (b) 150 g