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Chris has done a class survey.
There are 25 students in his class. 5 have blonde hair, 16 have dark hair and the rest have red hair.
How many students have red hair?
Solution:
16 + 5 = 21, so there are 21 students with either blonde or dark hair.
The rest have red hair. 25 – 21 = 4 so 4 students have red hair.
