SOLUTION: the ratio of children to adult is 7:3, and there are 820 people. how many are children? please explain...and thank you!!

Question 411182: the ratio of children to adult is 7:3, and there are 820 people. how many are children?
please explain...and thank you!!
Found 2 solutions by edjones, josmiceli:
Answer by edjones(8007) (Show Source): You can put this solution on YOUR website!
7+3=10
820/10=82
82*7=574 children
82*3=246 adults
.
Ed
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
I can say:
(children)/(adults) = 7/3
I can also say:
(children)/(children + adults) = 7/(7 +3)
and
(adults)/(children + adults) = 3/(7 + 3)
-------------------
I'm told that children + adults = 820
therefore

and

---------------

and

There are 574 children
check answer:

OK
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