Question

The difference between 4/5 of a number and 10 is 30. Solve for the unknown number (n)

Answer 1

Explanation:

Let the unknown number you are looking for be equal to n.

Hence,

`\displaystyle\\(4)/(5) *n-10=30\\\\(4)/(5) *n-10+10=30+10\\\\(4)/(5)*n=40`

Multiply both sides of the equation by 5/4:

`\displaystyle\\(4)/(5) *n*(5)/(4)=40*(5)/(4) \\\\n=50`

Answer: n=50