Respuesta :

3:4 of 84, means  "3 fourth" of 84.

To calculate " 3 fourth" of 84:

i) we divide 84 by 4, that is 84/4=21,

ii) we multiply the result of the division by 3:    21*3=63


Answer: 63 members of the choir are girls.


Remark: whenever we want to find a/b or "something":

i) divide "something" by b
ii) multiply the result by a


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