Divide 33 photos into two groups so the ratio is 4 to 7.

If the ratio is 4 to 7, the two piles of photos could be expressed as 4x and 7x, where x is a positive integer.

So 4x+7x=33

11x=33

x=3

4x=12, 7x=21

So the two piles of photos would be 12 and 21.

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