Jada, Nicholas, Nita, and Calvin shared $60. Jada received 1/2 of the total amount of money Nicholas, Nita, and Calvin received. Nicholas received 2/3 of the total amount of money

If they had the amounts w,x,y,z, then

x = 2/3 * 60 = 40
w+x+y+z = 60
w = (x+y+z)/2

so w+y+z = 20
w = (y+z)/2 + 20

y+z = 0
??? Seems unfair