Hello,

Am Lowell and I will soon go to a flight school for my PPL. But am learning the theoey and try to understand thing before I attend my class.

I found a question and an answer but I would like to know how they get this answer.

Q. Aircraft heading 355 true.variation 7 degree W.Drift 5 degree port.To obey the quadrantal rule.what altitude must you fly?

A. 6500ft

My question how they get it ?

Thank in advance