The answer to this question is £155
        
             
        
        
        
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
 
        
             
        
        
        
B. 700
1000 out of 700 is the same as 10 out of 7 but simplified
        
             
        
        
        
Before we get started, it is good to remember PEMDAS - the acronym that tells you the order to carry out equations.
P = parentheses
E = exponents
M = multiplication
D = division
A = addition
S = subtraction
Knowing this, we should start by doing the equations <em>within </em>each parentheses. 
 
 
So we did the addition and subtraction pieces within each group leaving us with the above equation. Now let's multiply:

20 is the answer.