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 = 160 g
(b)
Mass of U and W
= 450 - 160
= 290 g
Mass of U and V
= 470 - 160
= 310 g
Mass of V and W
= 520 - 160
= 360 g
(U + W) + (U + V) + (V + W) = 290 + 310 + 360
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) 160 g; (b) 160 g