H varies directly as L. If H=25 when L=50 determine H when L=10

h = kl  

 

h = 25    l = 50

   25 = k(50)     means the proprtionality constant, k, is   1/2

 

so    h = 1/2 L

        h = 1/2 (10) = 5     when L = 10