Question

Does anybody know this???

Answer 1

17

Explanation:

Let x be the number of books and y the number of CDs,

`x+y=25\\`

The prices of the products are multiplied with the quantity bought, therefore:

`1.5x + 5y = 65.50`

Multiplying the first equation by -5, then multiplying the two equations:

`-3.5x=-59.5\\x=17`