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 = 120 g
(b)
Mass of N and Q
= 430 - 120
= 310 g
Mass of N and P
= 400 - 120
= 280 g
Mass of P and Q
= 370 - 120
= 250 g
(N + Q) + (N + P) + (P + Q) = 310 + 280 + 250
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) 120 g; (b) 140 g