Respuesta :

6.64 divided by 5 gives us the amount for one ballon, which is 1.328.

So, 1.328 into 12 gives us the answer, which is 15.93.

Hope this helped and Happy New Year! :)
the cost of 5 balloons is 6.64 so the cost of one balloon is 6.64/5=1.328

and the cost of 12 balloons is 1.328*12=15.936