So she divided the 2/3 between 4 friends. 
So each friend got 2/3 divided by 4, which gives:
(2/3)*(1/4) = 2/12 = 1/6
        
             
        
        
        
The ratio of the volume of pipe a to the volume of pipe b is 27:1  .
<h3>What is cylinder?</h3>
A cylinder is a three-dimensional shape consisting of two parallel circular bases, joined by a curved surface. The center of the circular bases overlaps each other to form a right cylinder.
Given that,
Radius of pipe a is 6 cm, and the radius of pipe b is 2 cm.
We know that the volume of cylinder is :- 
 where r is radius and h is height of the cylinder.
 If two figures are similar then ratio of volume is equal to the cube of any dimension.
The ratio of the volume of Pipe a to the volume of Pipe b  :-

        = 
Hence, The ratio of the volume of pipe a to the volume of pipe b is 27:1 . 
To learn more about cylinder from the given link:
brainly.com/question/1392572
#SPJ4
 
        
             
        
        
        
There are going to be 10 cupcakes left,hope I helped (:
        
                    
             
        
        
        
Answer:
b. complementary 
Step-by-step explanation:
-Complementary angles are angles that add up to 90°.
-These are usually the two acute angles in the right triangle.
#To verify, lets take the two angles 30° and 60°:

#We can reverse as:

Hence, two angles are said to be complimentary if they sum up to 90°.