4:1 means for every four soccer player there is 1 volleyball player
that means there are four times the number of soccer players than volleyball players
The difference between two numbers are
and numbers are
and
so the equation is 
How to find the equation and what is the equation ?
equation, statement of equality between two expressions consisting of variables and/or numbers. In essence, equations are questions, and the development of mathematics has been driven by attempts to find answers to those questions in a systematic way.
if the difference of two numbers are 
And one number is
and another is 
So we write the equation with operation of subtraction

Learn more about the equations here :
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Answer: 1/2
First you do 4/4 times 4/4. Which is equal to 1. Then, you multiply by 2/4 to get 1/2.
Answer with Step-by-step explanation:
We are given
Volume of blood=V=7500 L=
1 liter=
Height of person=h=1.5 m
Density of blood,
We have to find the work done and power of person's heart.
We know that
Work done,
Where 
Using the formula

Time,t=1 day=
Power, P=
Using the formula

4 and a half days
3/4 ÷ 1/6 =
3/4 × 6/1=
18/4=
4.5 days
hope this helps :)