human
Cristina, John, Clarissa and Sarah want to give their mother a photo album for her birthday. Cristina brings 7 photos, John brings 10 photos and Sarah brings 9 photos. If the photo album has 40 slots available, how many photos does Clarissa need to bring in order to complete the photo album?
assistant
How many photos are there excluding Clarissa? ** Excluding Clarissa, there are 7 + 10 + 9 = <<7+10+9=26>>26 photos.
How many photos does Clarissa need to bring in order to complete the photo album? ** Clarissa needs to bring 40 – 26 = <<40-26=14>>14 photos to complete the photo album.
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