Answer:
A0 2/5
Step-by-step explanation:
First, find out how many girls there are by subtracting 8 (boys) from 20 (total). This means there are 12 girls. Since 8 girls aren't speaking, 4 are. 4+4=8. 8 out of the 20 children are speaking/ 8/20 simplified is 2/5
Answer:

Step-by-step explanation:
We have two triangles and three rectangles.
The formula of an area of a triangle:

b - base
h - height
The formula of an area of a rectangle:

l - length
w - width
TRIANGLE:
b = 11 in, h = 7 in

RECTANGLE 1:
l = 11 in, w = 14 in

RECTANGLE 2:
l = 9 in, w = 14 in

RECTANGLE 3:
l = 8 in, w = 14 in

The Surface Area:

Substitute:

It mean that everything is goin down and that there isnt anything interfering with it
Let’s start with putting the unknown to x, in this case it is the number.
5x-5=7+3x, so now we just solve this equation.
5x-3x=7+5
2x=12
x=6
the number is 6