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 = 120 g
(b)
Mass of S and U
= 330 - 120
= 210 g
Mass of S and T
= 400 - 120
= 280 g
Mass of T and U
= 410 - 120
= 290 g
(S + U) + (S + T) + (T + U) = 210 + 280 + 290
2 S + 2 T + 2 U = 780
2 x (S + T + U) = 780
S + T + U
= 780 ÷ 2
= 390 g
Average mass of the objects S, T and U
= 390 ÷ 3
= 130 g
Answer(s): (a) 120 g; (b) 130 g