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 = 160 g
(b)
Mass of B and D
= 450 - 160
= 290 g
Mass of B and C
= 440 - 160
= 280 g
Mass of C and D
= 430 - 160
= 270 g
(B + D) + (B + C) + (C + D) = 290 + 280 + 270
2 B + 2 C + 2 D = 840
2 x (B + C + D) = 840
B + C + D
= 840 ÷ 2
= 420 g
Average mass of the objects B, C and D
= 420 ÷ 3
= 140 g
Answer(s): (a) 160 g; (b) 140 g