A commuter has $245 i

Question

A commuter has $245 in his commuter savings account. a. This account changes by −$15 each week he buys a ticket. In one time period, the account changed by −$240. For how many weeks did the commuter buy tickets? _____________________________________________________________________________________

b. How much must he add to his account if he wants to have 20 weeks worth of tickets in his account? 

Answer 1

240 / 15 = 16

He rode for 16 weeks

To ride 20 weeks he needs $300

He has $5 left over. How much more does he need.