B is 12
c is 6 because you don't count the zero
The unknown is how many girls and boys are in the class.
Just simple proportions:
12(apples) x(apples)
-------------- = --------------
4(oranges) 7(oranges)
12*7 = 84
84/4 = 21
There are 21 apples + 7 oranges = 28 apples and oranges!
Answer:
infinity
Step-by-step explanation: