Question 751058
P varies jointly as m and u and inversely as q
p =kmu/q
4 = k*3*2/1
So k = 4/6 = 2/3

Formula => p = (2/3 * m * u)/q

           p = ( 2/3 * 6 * 4)/ 8/5
           p = ( 16 ) / 8/5
           p = (16 * 5)/8
           p = 80 / 8
           p = 10 

Hope this helps
:-)