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
