Answer:
15 hours
Step-by-step explanation:
To solve this you start by setting up the proportion: [tex]\frac{3}{x} \\\\[/tex] = [tex]\frac{20}{100}[/tex]. This is because we want to know if 3 hours is 20 percent, then how much is 100 percent.
Next we cross multiply to get 300 = 20x
Now we can divide both sides by 20 to get 15.
To check the work we can multiply 15 by .2 and we get 3, so we know it's correct.
Answer:
15 hours to do the entire project
Step-by-step explanation:
20% is the same as 1/5.
"percent" means "per 100", so 20% means 20/100 which reduces to 1/5.
20% of an art project took 3 hours. That means that 1/5 of the art project took 3 hours. The entire project then takes 5 times as much time.
5 * 3 hours = 15 hours
It takes 15 hours to do the entire project.
15 - 3 = 12
It takes 12 more hours after 20% was done.
