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

A commuter has $245 in his savings account.This account changes by -$15 each week when he buys a ticket. In one time period, the account changed by $240. For how many weeks did the commuter buy tickets?How much must he add to his account if he wants to have 20 weeks worth of tickets in his account?

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