PSLEThe graph shows the mass of a glass when empty and when different combinations of objects S, T and U are placed in the glass.
- What is the mass of the empty glass?
- What is the average mass of the objects S, T and U?
(a)
Mass of the empty glass = 110 g
(b)
Mass of S and U
= 480 - 110
= 370 g
Mass of S and T
= 440 - 110
= 330 g
Mass of T and U
= 430 - 110
= 320 g
(S + U) + (S + T) + (T + U) = 370 + 330 + 320
2 S + 2 T + 2 U = 1020
2 x (S + T + U) = 1020
S + T + U
= 1020 ÷ 2
= 510 g
Average mass of the objects S, T and U
= 510 ÷ 3
= 170 g
Answer(s): (a) 110 g; (b) 170 g