Can you solve the following question contributed by Uma from the United States in 5 minutes? Well, my fourth grade pupil managed to do that.

Question posted by Uma from the United States:

Grade/Level: Grade 4

Question: Janet bought a box of cookies for her friends. If she gives each of them 4 cookies, she will have 4 cookies left. if she gives each of them 5 cookies , she will need 5 more cookies. How many cookies are there in the box?

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