A worm climbing up a high wall went 15m on one day but slipped back by 3m 85cm in the evening. How far up had the warm reached that day?

Answer 1

How far up had the warm reached that day?
well, you said that "A worm climbing up a high wall went 15m on one day"
so, I guess 15 meters, eh?

Of course, you may want to subtract the 3.85m it slipped back, but that's not clear from what you said...