PSLEThe graph shows the mass of a glass when empty and when different combinations of objects M, N and P are placed in the glass.
- What is the mass of the empty glass?
- What is the average mass of the objects M, N and P?
(a)
Mass of the empty glass = 160 g
(b)
Mass of M and P
= 380 - 160
= 220 g
Mass of M and N
= 460 - 160
= 300 g
Mass of N and P
= 480 - 160
= 320 g
(M + P) + (M + N) + (N + P) = 220 + 300 + 320
2 M + 2 N + 2 P = 840
2 x (M + N + P) = 840
M + N + P
= 840 ÷ 2
= 420 g
Average mass of the objects M, N and P
= 420 ÷ 3
= 140 g
Answer(s): (a) 160 g; (b) 140 g