145 % of 180 + ? % of 320 = 741

$frac{{145}}{{100}} imes 180 + frac{?}{{100}} imes 320 = 741$

$261 + frac{?}{{100}} imes 320 = 741$

$frac{?}{{100}} imes 320 = 741 - 261$

$? = frac{{480 imes 100}}{{320}} Rightarrow ? = 150$