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 = 130 g
(b)
Mass of M and P
= 360 - 130
= 230 g
Mass of M and N
= 350 - 130
= 220 g
Mass of N and P
= 340 - 130
= 210 g
(M + P) + (M + N) + (N + P) = 230 + 220 + 210
2 M + 2 N + 2 P = 660
2 x (M + N + P) = 660
M + N + P
= 660 ÷ 2
= 330 g
Average mass of the objects M, N and P
= 330 ÷ 3
= 110 g
Answer(s): (a) 130 g; (b) 110 g