Tea worth $75 \in$ per pound is mixed with tea worth $90 \in $ per pound to produce $10$ pounds of a mixture worth $85 \in$ per pound. How many pound of each type of tea is used ?

Question

$\begin{array}{1 1} a)\;6 \frac{1}{3}\;and\;3\frac{1}{3} \\ b)\;3 \frac{1}{3}\;and\;6\frac{2}{3} \\ c)\;2 \frac{1}{3}\;and\;7\frac{1}{3} \\ d)\;7 \frac{1}{3}\;and\;2\frac{1}{3} \end{array} $