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