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 = 150 g
(b)
Mass of N and Q
= 460 - 150
= 310 g
Mass of N and P
= 490 - 150
= 340 g
Mass of P and Q
= 520 - 150
= 370 g
(N + Q) + (N + P) + (P + Q) = 310 + 340 + 370
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) 150 g; (b) 170 g