kelly went back-to-school shopping this weekend. she spent $225 on jeans and
shirts. she bought a total of 14 items, with jeans costing $18 and shirts costing
$15. how many shirts did she buy?

Kelly bought 9 shirts.

Solution:

As given she spent total on jeans and shirt

Let us assume that she bought x number of jeans and y number of shirts

She bought total 14 items,

Hence

………… (i)

Each jens costs , So x number of jeans will cost total

Each shirt costs , so y number of shirts will cost total

So we can say ,

………… (ii)

Now substituting value of  (i) in (ii) we get,

So,

She bought 9 shirts.