A social networking site recorded that 80% of the people who became members of the site one month were between 30 and 40 years old. The equation below represents this information, where x represents the total number of people who became members of the site that month.

x = 0.8x + 72

How many people who became members of the site that month were between 30 and 40 years of age?

Question

A social networking site recorded that 80% of the people who became members of the site one month were between 30 and 40 years old. The equation below represents this information, where x represents the total number of people who became members of the site that month.

x = 0.8x + 72

How many people who became members of the site that month were between 30 and 40 years of age?

anonymous · Answer

Subtract each side by 0.8x and divide.

anonymous · Answer

288

anonymous · Answer

Oh, my bad, I misread the question! :-)

anonymous · Answer

:) lol it happens a lot to me

anonymous · Answer

Or did I? Isn't the information given about the people who were between 30 and 40? Which means you don't have to multiply by 0.8?