Question

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?

Answer 1

The answer is 9 shirts 9x15=135 5x18=90 =225

Answer 2

Kelly bought 9 shirts.

Solution:

As given she spent total
`\$225` 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
`x+y = 14`

`x=(14-y)` ………… (i)

Each jens costs
`\$18`, So x number of jeans will cost total
`\$18x`

Each shirt costs
`\$15`, so y number of shirts will cost total
`\$15y`

So we can say ,

`18x +15y = 225` ………… (ii)

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

`18*(14-y) +15y = 225`

`252 -18y +15y = 225`

`-3y = 225 -252`

`-3y=-27`

`y = 9`

So,
`x = (14-9) = 5`

She bought 9 shirts.