Найдите х и у,если среднее арифметическое чисел х и у равно 22,5 и 1/3 их разности равна...

Решите задачу:

$\left \{ {{x+y=22.5*2} \atop {x-y=1 \frac{2}{3}: \frac{1}{3} }} \right. \\ \\ \left \{ {{x+y=45} \atop {x-y=\frac{5}{3}* \frac{3}{1} }} \right. \\ \\ \left \{ {{x=45-y} \atop {x-y=5}} \right. \\ \\ \left \{ {{x=45-y} \atop {45-y-y=5}} \right. \\ \\ \left \{ {{x=45-y} \atop {2y=40}} \right. \\ \\ \left \{ {{x=45-y} \atop {y=20}} \right. \\ \\ \left \{ {{x=45-20} \atop {y=20}} \right. \\ \\ \left \{ {{x=25} \atop {y=20}} \right.$