Let x + 15 = total penguins
15/ (x +15) = .30
15 = .30x + 4.5
.30x  = 10.5
x = 35
Total penguins = 15 + 35 = 50
Double Check
15 / 50 * 100 = 30%  Correct!!!
 
        
             
        
        
        
Answer:
35/6
Step-by-step explanation:
The formula to find the volume of a rectangular prism is V = Bh. To start off, change the Base and height fractions into improper fractions. Multiply them to get 35/6. 
 
        
                    
             
        
        
        
Is the arrow the length of the rotation? 90 degrees? if so, the second picture is, with the star at the highest point of the other pictures.
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Answer:
Volume of the empty space in the can  is 327.05  
Step-by-step explanation:
Given:
Number of golf ball the can holds = 4
Diameter of the golf ball = 5 cm
To Find:
Volume of the empty space in the can = ?
Solution:
Step 1:  Finding the volume of one golf ball
Ball is shape of the sphere
So lets use the volume of the sphere formula
Volume of the  golf ball = 
Radius = = 2.5 cm
 = 2.5 cm
Substituting the values
Volume of the  golf ball  
=
=
= 
= 
= 65.41
Step 2:  Finding the volume of empty space of the can
volume of empty space of the can =  volume of 5 golf ball
= 5 X 65.41
= 327.05