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 = 110 g
(b)
Mass of U and W
= 400 - 110
= 290 g
Mass of U and V
= 370 - 110
= 260 g
Mass of V and W
= 460 - 110
= 350 g
(U + W) + (U + V) + (V + W) = 290 + 260 + 350
2 U + 2 V + 2 W = 900
2 x (U + V + W) = 900
U + V + W
= 900 ÷ 2
= 450 g
Average mass of the objects U, V and W
= 450 ÷ 3
= 150 g
Answer(s): (a) 110 g; (b) 150 g