Question 984183
let x be the no of female volunteers last year
and y be the no of male volunteers  last year
  x+y= 375
 no of male volunteers increased by 20 %
      so  no of male volunteers this year  = y+20 % of y
                 = y+0.2 y
      =1.2y
similarly no of female vounteers  this year  = x+0.3x  = 1.3x
     1.3x  =1.2 y
    {{{ 1.3x/1.2 =y}}}
 
  but x+y =375
     {{{ x+(1.3x/1.2) =375}}}
      {{{ (1.2x+1.3x)/1.2 =375}}}
        {{{ 1.5x/1.2 =375}}}
             {{{ 1.5 x= 375*1.2}}}
             {{{1.5x =450}}}
            {{{ x=300}}}
no of female volunteers last year  = 300
  this  year , increse = 20 % of 300
           = 60
result:60