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

Answer:

n = 90

Step-by-step explanation:

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

72 = 80% of n

72   = $\frac{80}{100}$ ×  n

72  =  $\frac{80 n}{100}$

Multiply both-side of the equation by 100

72 × 100 =  $\frac{80 n}{100}$   ×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

$\frac{7200}{80}$  =  $\frac{80n}{80}$

(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)

$\frac{7200}{80}$   =   n

90  =  n

n = 90

Answer 2

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.