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 = 100 g
(b)
Mass of E and G
= 390 - 100
= 290 g
Mass of E and F
= 340 - 100
= 240 g
Mass of F and G
= 410 - 100
= 310 g
(E + G) + (E + F) + (F + G) = 290 + 240 + 310
2 E + 2 F + 2 G = 840
2 x (E + F + G) = 840
E + F + G
= 840 ÷ 2
= 420 g
Average mass of the objects E, F and G
= 420 ÷ 3
= 140 g
Answer(s): (a) 100 g; (b) 140 g