Solve the following proportions, n12=618

Step 1
Solve the following proportions,
${\displaystyle \frac{n}{12}=\frac{6}{18}}$
Cross-multiply the given equation,we get
${\displaystyle 18\times n=6\times 12}$
Dividing both sides by 18, we get
${\displaystyle \frac{18\times n}{18}=\frac{6\times 12}{18}}$
${\displaystyle n=4}$ is the solution.
Step 2
Solve the following proportions,
${\displaystyle \left(\frac{3.5}{7.2}\right)=\left(\frac{k}{57.6}\right)}$
Cross-multiply the given equation,we get
${\displaystyle 3.5\times 57.6=k\times 7.2}$
Dividing both sides by 7.2, we get
${\displaystyle \frac{3.5\times 57.6}{7.2}=\frac{k\times 7.2}{7.2}}$
${\displaystyle k=28}$ is the solution.
Step 3
Simplify the following ratio 50 to 40
${\displaystyle =\frac{50}{40}=\frac{5}{4}}$
Solution ${\displaystyle =5}$ to 4.
Step 4
Simplify the following ratio 44 to 80
${\displaystyle =\frac{44}{80}=\frac{11}{20}}$
Solution ${\displaystyle =11}$ to 20.

Answer is given below (on video)