Question

72 is equal to 80% of a number n. Write and solve and equation to find n. Write the percent as a decimal.

Answer 1

Well I'm not sure what the answer would be since I'm not that smart but I did get the answer of 90, I did this by dividing 72 by 80 which equals .9 and I multiplied that by 100 and got 90.

Answer 2

n = 90

Explanation:

To solve this, we need to write the questions mathematically and then solve

72 = 80% of n

72 =
`(80)/(100)` × n

72 =
`(80 n)/(100)`

Multiply both-side of the equation by 100

72 × 100 =
`(80 n)/(100)` ×100

At the right-hand side of the equation, 100 will cancel-out 100, leaving us with just 80 n

7200 = 80 n

Divide both-side of the equation by 80

`(7200)/(80)` =
`(80n)/(80)`

(On the right-hand side of the equation, 80 will cancel out 80 leaving us with just n while on the left-hand side of the equation 7200 will be divide by 80)

`(7200)/(80)` = n

90 = n

n = 90