PSLEThe graph shows the mass of a glass when empty and when different combinations of objects N, P and Q are placed in the glass.
- What is the mass of the empty glass?
- What is the average mass of the objects N, P and Q?
(a)
Mass of the empty glass = 100 g
(b)
Mass of N and Q
= 420 - 100
= 320 g
Mass of N and P
= 400 - 100
= 300 g
Mass of P and Q
= 380 - 100
= 280 g
(N + Q) + (N + P) + (P + Q) = 320 + 300 + 280
2 N + 2 P + 2 Q = 900
2 x (N + P + Q) = 900
N + P + Q
= 900 ÷ 2
= 450 g
Average mass of the objects N, P and Q
= 450 ÷ 3
= 150 g
Answer(s): (a) 100 g; (b) 150 g