Age problem variable now

Question

Joseph is 4 years older than Mikayla. In 6 years the sum of their ages will be 78. How old is Joesph now?

Answer 1

j= m+4

j+6 + m+6 = 78

J+m = 78-12= 66

m+4 + m = 66

2m = 62

m = 31

j = m+4 = 35 years old now for Joseph's age

m = 31 now

in 6 years they'll be 37 + 41 = 78