The total height of 3 pupils is 5.17 m. Cheko is 0.23 m shorter than Mei. Mei is 24 cm taller than Miko. What is Miko's height in metres?
Let M be Miko's height in cm.
Mei's height is M + 24 cm
Cheko's height is M + 24 cm - 0.23 m = M + 23.77 cm
The total height is M + (M + 24) cm + (M + 23.77) cm = 5.17 m = 517 cm
Combining like terms, we get 3M + 47.77 cm = 517 cm
Subtracting 47.77 cm from both sides, we get 3M = 469.23 cm
Dividing both sides by 3, we get M = <<157=157>>157. Answer: \boxed{1.57}.