PSLEThe graph shows the mass of a glass when empty and when different combinations of objects U, V and W are placed in the glass.
- What is the mass of the empty glass?
- What is the average mass of the objects U, V and W?
(a)
Mass of the empty glass = 180 g
(b)
Mass of U and W
= 500 - 180
= 320 g
Mass of U and V
= 490 - 180
= 310 g
Mass of V and W
= 510 - 180
= 330 g
(U + W) + (U + V) + (V + W) = 320 + 310 + 330
2 U + 2 V + 2 W = 960
2 x (U + V + W) = 960
U + V + W
= 960 ÷ 2
= 480 g
Average mass of the objects U, V and W
= 480 ÷ 3
= 160 g
Answer(s): (a) 180 g; (b) 160 g