Answer:
25 boys
Step-by-step explanation:
girls to boys
7:5
35:x
set up an equation
if
35/7 = 5
then
x/5 = 5
so, multiply both sides by 5 to isolate x.
x = 25
20 units
s = 8
Perimeter = s + s +
= 8 + 8 + 4
= 20 units