u were given $ 130 as a birthday gift. u first had to pay ur bro back $ 20 that u owed him. u then went to the clothing store and stocked up on t-shirts because they were on sale for $ 15 a piece. And now ur broke. How many t-shirts did u purchase ?
15x - 20 < = 130
15x < = 130 + 20
15x < = 150
x < = 150/15
x < = 10...so u bought 10 t-shirts