Benzene and toluene help achieve good engine performance from lead$-$free gasoline. At $40C,$ the vapor pressure of benzene is $184$ torr and that of toluene is $58$ torr. Suppose you wished to prepare a solution of these liquids that will have a total vapor pressure of $69$ torr at $40C.$ What must be the mole percent concentrations of each in the solution?

mol$\%$ toluene

mol $\%$ benzene