apparently it makes green

at dinner the other ngiht the resturant agve my daughter three crayone, yellow, blue and red, the primary colors. I explained combined colors and primary colors to my daughter while we were waiting for the waitress and she was impressed, I asked her what color blue and yellow made- she took the crayons and colored yellow on her menu in a small dot then colored over it with blue and looekd at me very seriously and said.." apparently, it makes green" in a " gheeeze mom don't you know this stuff already!"