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 = 130 g
(b)
Mass of N and Q
= 510 - 130
= 380 g
Mass of N and P
= 470 - 130
= 340 g
Mass of P and Q
= 490 - 130
= 360 g
(N + Q) + (N + P) + (P + Q) = 380 + 340 + 360
2 N + 2 P + 2 Q = 1080
2 x (N + P + Q) = 1080
N + P + Q
= 1080 ÷ 2
= 540 g
Average mass of the objects N, P and Q
= 540 ÷ 3
= 180 g
Answer(s): (a) 130 g; (b) 180 g