A class has a ratio of 3:6:7 of children with red hair, blonde hair and black hair respectively. If the class has 9 kids with red hair, how many kids are in the class?	Choose the correct choice from the following answers
A) 99 B) 48 C) 16 D) 22 E) 60
Since there are 9 children with red hair, and the class exists in a 3:6:7 ratio, there are 3 times more children than the unit ratio. Therefore   9 red-haired children   3*(6) blonde-haired children   3*(7) black-haired children   9+18+21= 
<gadget id="calculator">9+18+21</gadget>
<output>48</output>
48   Alternatively, a part-to-whole ratio can be set up. Since the whole is   3+6+7= 
<gadget id="calculator">  3+6+7</gadget>
<output>16</output>
16,   9/3=X/16   3*16= 
<gadget id="calculator">3*16</gadget>
<output>48</output>
48   Answer: 48)
<result>B</result>
A class has a ratio of 3:6:7 of children with red hair, blonde hair and black hair respectively. If the class has 9 kids with red hair, how many kids are in the class?