Question

Greg bought 2 boxes of balloons he used half of them to decorate his yard he used 40 to decorate his porch he used the rest inside his house how many balloons did he use

Answer 1

You need more information like how many balloons there per box.we suppose it is 100. And we know that he uses 1 box for yard.Then you use 100-40 to get the answer 60.