The population of a certain city in 2017 was 105000 this represents a 12.5 decrease from 2010 population what was the 2010 population

Let's make an equation to show how to get how many people were in 105,000.

But, with a decrease, you have to decrease it from 100.

100-12.5

87.5

So it will be 87.5 of what it was previously. Now let's get to the equation.

.875x=105,000

Let's divide each side.

105,000:.875

120,000

Let's check if this was a 12.5% decrease.

120,000*0.125

15,000

120,000-15,000

105,000

So the population of 2010 was 120,000 people.