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 = 140 g
(b)
Mass of W and Y
= 380 - 140
= 240 g
Mass of W and X
= 430 - 140
= 290 g
Mass of X and Y
= 450 - 140
= 310 g
(W + Y) + (W + X) + (X + Y) = 240 + 290 + 310
2 W + 2 X + 2 Y = 840
2 x (W + X + Y) = 840
W + X + Y
= 840 ÷ 2
= 420 g
Average mass of the objects W, X and Y
= 420 ÷ 3
= 140 g
Answer(s): (a) 140 g; (b) 140 g