PSLEThe graph shows the mass of a glass when empty and when different combinations of objects E, F and G are placed in the glass.
- What is the mass of the empty glass?
- What is the average mass of the objects E, F and G?
(a)
Mass of the empty glass = 140 g
(b)
Mass of E and G
= 440 - 140
= 300 g
Mass of E and F
= 460 - 140
= 320 g
Mass of F and G
= 420 - 140
= 280 g
(E + G) + (E + F) + (F + G) = 300 + 320 + 280
2 E + 2 F + 2 G = 900
2 x (E + F + G) = 900
E + F + G
= 900 ÷ 2
= 450 g
Average mass of the objects E, F and G
= 450 ÷ 3
= 150 g
Answer(s): (a) 140 g; (b) 150 g