Answer:
36
Explanation:
We have the ratio 3:6(girls to boys)
Now lets simply put 18 below the 3. We know 18 to something has to equal 3:6.
Simply divided 18/3=6
Now we have 6. Simply multiply it by the number of boys.
6*6, which equals 36 boys,
Your answer would be 36 boys
Now if we put 18:36, we get the ratio 3:6, which further reduces down to 1:2.
Hope this helps!