10 1/2 divided by 3/4

\(\dfrac{\dfrac a b }{\dfrac c d} = \dfrac a b \dfrac d c\)

\(10~\dfrac 1 2 = \dfrac{21}{2}\\\)

\(\dfrac{\dfrac{21}{2}}{\dfrac 3 4} = \dfrac{21}{2} \dfrac{4}{3} = \dfrac{84}{6} = 14\)