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 = 150 g
(b)
Mass of E and G
= 370 - 150
= 220 g
Mass of E and F
= 410 - 150
= 260 g
Mass of F and G
= 390 - 150
= 240 g
(E + G) + (E + F) + (F + G) = 220 + 260 + 240
2 E + 2 F + 2 G = 720
2 x (E + F + G) = 720
E + F + G
= 720 ÷ 2
= 360 g
Average mass of the objects E, F and G
= 360 ÷ 3
= 120 g
Answer(s): (a) 150 g; (b) 120 g