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?
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was that equation given to you. it seems wrong.
Thats what the question said
where did 72 come from? The people between 30 and 40 would be .80 times the total.