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 = 120 g
(b)
Mass of C and E
= 440 - 120
= 320 g
Mass of C and D
= 490 - 120
= 370 g
Mass of D and E
= 450 - 120
= 330 g
(C + E) + (C + D) + (D + E) = 320 + 370 + 330
2 C + 2 D + 2 E = 1020
2 x (C + D + E) = 1020
C + D + E
= 1020 ÷ 2
= 510 g
Average mass of the objects C, D and E
= 510 ÷ 3
= 170 g
Answer(s): (a) 120 g; (b) 170 g