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 = 180 g
(b)
Mass of N and Q
= 520 - 180
= 340 g
Mass of N and P
= 500 - 180
= 320 g
Mass of P and Q
= 540 - 180
= 360 g
(N + Q) + (N + P) + (P + Q) = 340 + 320 + 360
2 N + 2 P + 2 Q = 1020
2 x (N + P + Q) = 1020
N + P + Q
= 1020 ÷ 2
= 510 g
Average mass of the objects N, P and Q
= 510 ÷ 3
= 170 g
Answer(s): (a) 180 g; (b) 170 g