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 = 170 g
(b)
Mass of N and Q
= 450 - 170
= 280 g
Mass of N and P
= 460 - 170
= 290 g
Mass of P and Q
= 440 - 170
= 270 g
(N + Q) + (N + P) + (P + Q) = 280 + 290 + 270
2 N + 2 P + 2 Q = 840
2 x (N + P + Q) = 840
N + P + Q
= 840 ÷ 2
= 420 g
Average mass of the objects N, P and Q
= 420 ÷ 3
= 140 g
Answer(s): (a) 170 g; (b) 140 g