Question

A store sells T-shirts $10 each and jeans for $20 a pair. Anna spends $150 for T-shirts and jeans. she buys x T-shirts and y pairs of jeans. what is the equation and how many T-shirts can she buy with the money she has left.

Answer 1

10x+20y=150 is the equation I don't quite understand how she would have money left because she spend $150 for her t-shirts and jeans.