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 = 150 g
(b)
Mass of W and Y
= 410 - 150
= 260 g
Mass of W and X
= 380 - 150
= 230 g
Mass of X and Y
= 440 - 150
= 290 g
(W + Y) + (W + X) + (X + Y) = 260 + 230 + 290
2 W + 2 X + 2 Y = 780
2 x (W + X + Y) = 780
W + X + Y
= 780 ÷ 2
= 390 g
Average mass of the objects W, X and Y
= 390 ÷ 3
= 130 g
Answer(s): (a) 150 g; (b) 130 g