PSLEThe graph shows the mass of a glass when empty and when different combinations of objects B, C and D are placed in the glass.
- What is the mass of the empty glass?
- What is the average mass of the objects B, C and D?
(a)
Mass of the empty glass = 150 g
(b)
Mass of B and D
= 360 - 150
= 210 g
Mass of B and C
= 440 - 150
= 290 g
Mass of C and D
= 430 - 150
= 280 g
(B + D) + (B + C) + (C + D) = 210 + 290 + 280
2 B + 2 C + 2 D = 780
2 x (B + C + D) = 780
B + C + D
= 780 ÷ 2
= 390 g
Average mass of the objects B, C and D
= 390 ÷ 3
= 130 g
Answer(s): (a) 150 g; (b) 130 g