The mass of JM's father is 7/3 of JM's mass. What fraction of their total mass is JM's mass? what is the total mass if the mass of JM's father is 36 kg more than JM's mass?
JM's mass ---- x
Dad's mass --- 7x/3
7x/3 = x + 36
7x = 3x + 108
4x = 108
x = 27
total = x + 7x/3
= 27 + 27(7/3)
= 27 + 63
= 90 kg