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 = 110 g
(b)
Mass of E and G
= 470 - 110
= 360 g
Mass of E and F
= 420 - 110
= 310 g
Mass of F and G
= 400 - 110
= 290 g
(E + G) + (E + F) + (F + G) = 360 + 310 + 290
2 E + 2 F + 2 G = 960
2 x (E + F + G) = 960
E + F + G
= 960 ÷ 2
= 480 g
Average mass of the objects E, F and G
= 480 ÷ 3
= 160 g
Answer(s): (a) 110 g; (b) 160 g