at the faculty of aerospace engineering , 312 students study random - processing methods , 222 students study scramjet rocket engines and 112 students study them both . if every student in the faculty has to study one of the two subjects , how many students are there in the faculty of aerospace engineering ?
"312 + 222 - 112 ( since 112 is counted twice ) = 422 e is the answer"
add(subtract(312, divide(112, const_2)), subtract(222, divide(112, const_2)))