Answer:
So, he starts out with $15. Then, Monday - Friday he spends 1.50 every day. (Except Friday.) So then you do 4 days x 1.50 (5 x 1.50 = 6) and that equals 6. Then on Friday, he buys 4 pieces of pizza, and a piece of pizza equals $1.40. So then you do 4 x 1.40, and that equals 5.6. (4 x 1.40 = 5.6) Now you add up 5.6 and 6, and you get 11.6. (5.6 + 6 = 11.6) Then you subtract 11.6 from 15 and you get 3.4! (15 - 11.6 = 3.4)
So, after the week, he has $3.4, so spend on whatever else.
Hope this helps!!!!!!