10. Children are assembling robot toys. At first, every 2 children work together to assemble 1 small robot toy, then every 3 children work together to assemble 1 large robot toy, resulting in a total of 30 robots of various sizes. How many children are there $\qquad$?
【Analysis】There are 18 small toys and 12 large toys in 30 toys; therefore, there are a total of 36 children.