Question 975144
14G : 220 T : 3D  =  xG : 170 T : 5D 

case 1 : rate / gardener = 220 / (14 X 3)

case 2 : rate / gardener = 170 / ( x X 5)

both the rates are equal 

220 / (14 X 3 ) = 170 / (x X 5) 

x = 6.49 round it to 7 
 so x = 7 Gardeners