Mute cycled to raise fund for a charitable organization on the first day he cycled for 40km .for the first 10 days he cycled 3km less on each subsequent day, Thereafter he cycled 2km less
Calculate the distance on the 10th day
On the first day, Mute cycled for 40km.
For the next 9 days, he cycled 3km less on each subsequent day. This means on the 10th day, he cycled 40km - (9 * 3km) = 40km - 27km = <<40-(9*3)=13>>13km less.
Therefore, on the 10th day, Mute cycled 40km - 13km = <<40-13=27>>27km. Answer: \boxed{27}.