Blackie's mass is 4kg less than Jessie's mass. Together, Blackie and Jessie have a mass of 72kg. What is each dog's mass?

Answer 1

b = j-4
b+j = 72
now solve

Answer 2

Together, Blackie and Jessie have a mass of 72 kg.
Blackie’s mass is 4 kg less than Jessie’s mass. What is
each dog’s mass?