Answer:
Ross has 450 stickers.
Explanation:
Ross gave stickers to his sister = 297
If 66% of stickers Ross gave to his sister, how many stickers does Ross have?
Let Ross have stickers = x
So, we can write:

Now solving this equation and finding value of x

We get x = 450. We know x= Number of stickers Ross has
So, Ross has 450 stickers.