Answer:
18 boys
Step-by-step explanation:
boys/girls = 3/11 = b/66
3/11 = b/66
11b = 3 × 66
b = 3 × 6
b = 18
There are 18 boys.
17
4 × 3² = 36
2 × 7 = 14
36 ÷ 12 = 3
3 ± 14 = 17