Explain why you can use subtraction to solve a division problem

Lucy is a dress maker. she sews \dfrac47 7 4 of a dress in \dfrac34 4 3 hour. lucy sews at a constant rate. at this rate, how many dresses does lucy sew in one hour? include fractions of dresses if applicable

Given: ab ≅ bc and ao ≅ oc ok − angle bisector of ∠boc find: m∠aok

Meee i honestly dont know what this question talking about