यदि `a : b = c : d` तो `(ma +nc)/(mb + nd)` किसके बराबर है। #percentage #tet #class7th #sscmts #upscexam #allcompetitiveexams #ssc #dsssb #education #class6th #indianedupoint19 #percentage #ratioandproportion #ratioandproportioninhindi #ratio #ratioandproportionshortcuttricks #ratioandproportiontricksinhindi