Question

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in a class of 30 students 20%have black hair 10%have blonde hair and 70%have brown hair calculate the numbers of students black hair blonde hair and brown hair​

Answer 1

6 students have black hair, 3 students have blonde hair, and 21 students have brown hair. since percentages come out of 100% you can use ten as a smaller size, so 20% of 10 is 1, multiply that by three because our full percentage is out of 30, and you get 3, and so on.