1949×( 1/5 1- 1/2000)+5 1×( 1/ 1949- 1/2000)-2000×( 1/ 1949+ 1/5 1)+3=? Of the 400 natural numbers from 1. 1 to 400, how many are not multiples of 2 or 3? Students go to plant trees. If we take two girls and three boys as a group, the girls will be divided into 1 boy. If we take three girls and five boys as a group, m-girls will be left after the boys are divided. How many boys and girls are involved in planting trees? A man bought 24 bottles of beer, but three empty bottles can be exchanged for one bottle of beer. Q: How many bottles of beer did this man drink at most?