Question

John produced six times as many books as his brother. If their difference in production is 15, how many books did his brother produce

Answer 1

J = 6B
J - B = 15

6B - B = 15
5B = 15
B = 15/5
B = 3 <=== the brother produces 3 books

J = 6B
J = 6(3)
J = 18.....and John produces 18