After Justin had stacked up 16 chairs in the canteen after a gathering, he noticed 3 things. Firstly, each of the chairs was stacked the same height above the other. Secondly, the foot of the ninth chair was 126.4 cm above that of the first. Thirdly, the chairs reached a height of 325.3 cm. What is the height of each chair?
Number of chairs that contributed to the height of 126.4 cm above the first chair
= 9 - 1
= 8

Height increase with each additional stacked chair
= 126.4 ÷ 8
= 15.8 cm

Number of chairs stacked on top of the first chair
= 16 - 1
= 15

Height increase of 15 additional stacked chairs
= 15 x 15.8
= 237 cm

Height of one chair
= 325.3 - 237
= 88.3 cm

Answer(s): 88.3 cm