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 = 120 g
(b)
Mass of M and P
= 450 - 120
= 330 g
Mass of M and N
= 490 - 120
= 370 g
Mass of N and P
= 440 - 120
= 320 g
(M + P) + (M + N) + (N + P) = 330 + 370 + 320
2 M + 2 N + 2 P = 1020
2 x (M + N + P) = 1020
M + N + P
= 1020 ÷ 2
= 510 g
Average mass of the objects M, N and P
= 510 ÷ 3
= 170 g
Answer(s): (a) 120 g; (b) 170 g