PSLEThe graph shows the mass of a glass when empty and when different combinations of objects C, D and E are placed in the glass.
- What is the mass of the empty glass?
- What is the average mass of the objects C, D and E?
(a)
Mass of the empty glass = 190 g
(b)
Mass of C and E
= 420 - 190
= 230 g
Mass of C and D
= 450 - 190
= 260 g
Mass of D and E
= 480 - 190
= 290 g
(C + E) + (C + D) + (D + E) = 230 + 260 + 290
2 C + 2 D + 2 E = 780
2 x (C + D + E) = 780
C + D + E
= 780 ÷ 2
= 390 g
Average mass of the objects C, D and E
= 390 ÷ 3
= 130 g
Answer(s): (a) 190 g; (b) 130 g