the difference of two positive numbers is 3. one number is 3/4 of the other number. find the two numbers

Question

College Algebra question

Answer 1

let x and x+3 be the numbers

x/(x+3)=3/4

 cross multiply

4x=3(x+3)

4x=3x+9

4x-3x=9

x=9 and x+3=12

check:

9/12=3/4

Answer 2

n is one number

0.75n is the other number

 

n - 0.75n =3

 

Can you solve for n and answer?