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?

Answer 1

was that equation given to you. it seems wrong.

Answer 2

Thats what the question said

Answer 3

where did 72 come from? The people between 30 and 40 would be .80 times the total.

Answer 4

i have no idea..

Answer 5

i just need help

Answer 6

ok. Let's solve the equation for x. So we are solving for the total of people who joined.

Answer 7

okay, i am so confused haha

Answer 8

x = 0.8x + 72
x - .8x = .8x + 72 - .8x
.2x = 72 Divide both sides by .2
x = 360

Now that we know the total we can multiply this by 80% of .8 to get ppl between 30-40

Answer 9

thank you so much!(;

Answer 10

yw