Question

During a school lunch, the cafeteria sold two-fifths as many white milks as chocolate milks. if there were 35 milks sold, how many chocolate milks were sold?

Answer 1

c + w = 35
w = 2/5c

c + 2/5c = 35
5/5c + 2/5c = 35
7/5c = 35
c = 35 / (7/5)
c = 35 * 5/7
c = 175/7
c = 25 <=== there were 25 chocolate milks sold

c + w = 35
25 + w = 35
w = 35 - 25
w = 10.....there were 10 white milks sold