C-11-Q046mediumsingle_mcq2a+3b2a−3b=51\dfrac{2a+3b}{2a-3b}=\dfrac{5}{1}2a−3b2a+3b=15 হলে 2a:3b=?2a:3b = ?2a:3b=?a3:23:23:2b2:32:32:3c4:64:6