PSLEThe graph shows the mass of a glass when empty and when different combinations of objects K, L and M are placed in the glass.
- What is the mass of the empty glass?
- What is the average mass of the objects K, L and M?
(a)
Mass of the empty glass = 110 g
(b)
Mass of K and M
= 450 - 110
= 340 g
Mass of K and L
= 470 - 110
= 360 g
Mass of L and M
= 430 - 110
= 320 g
(K + M) + (K + L) + (L + M) = 340 + 360 + 320
2 K + 2 L + 2 M = 1020
2 x (K + L + M) = 1020
K + L + M
= 1020 ÷ 2
= 510 g
Average mass of the objects K, L and M
= 510 ÷ 3
= 170 g
Answer(s): (a) 110 g; (b) 170 g