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 = 150 g
(b)
Mass of U and W
= 420 - 150
= 270 g
Mass of U and V
= 440 - 150
= 290 g
Mass of V and W
= 370 - 150
= 220 g
(U + W) + (U + V) + (V + W) = 270 + 290 + 220
2 U + 2 V + 2 W = 780
2 x (U + V + W) = 780
U + V + W
= 780 ÷ 2
= 390 g
Average mass of the objects U, V and W
= 390 ÷ 3
= 130 g
Answer(s): (a) 150 g; (b) 130 g