After Albert had stacked up 10 chairs in the basketball court after a parade, he noticed 3 things. Firstly, each of the chairs was stacked the same height above the other. Secondly, the foot of the fourth chair was 19.2 cm above that of the first. Thirdly, the chairs reached a height of 136.3 cm. What is the height of each chair?
Number of chairs that contributed to the height of 19.2 cm above the first chair
= 4 - 1
= 3

Height increase with each additional stacked chair
= 19.2 ÷ 3
= 6.4 cm

Number of chairs stacked on top of the first chair
= 10 - 1
= 9

Height increase of 9 additional stacked chairs
= 9 x 6.4
= 57.6 cm

Height of one chair
= 136.3 - 57.6
= 78.7 cm

Answer(s): 78.7 cm