Posted by jiejie on Saturday, September 10, 2011 at 4:19am.
There were 335 children in a hall. 1/4 of the girls and 2/5 of the boys are swimmers. There are 110 swimmers in all. How many boys are there in the hall? (need nonalgebra or model to solve, pls)

maths P5  jiejie, Saturday, September 10, 2011 at 4:53am
nvm, found the solution already