she has 1150.she used 84 for shirts. the rest may be used for watches. so this can be modeled, knowing that each watch costs 99, by the equation:
1150=99x+84 because 1150 is shirt money and watch money put together. watch money is some number times 99.
so subtract 84 from both sides.
so 1066=99x and then divide both sides by 99
so x=10.76(76repeating forever)
you cant get a fraction of a watch, so the answer is 10
