Posted by Bella on Thursday, January 8, 2009 at 12:27am.
The ratio of adults to children at a holiday concert is expected to be 5 to 2. If 490 peole attend, approximately how many will be children? How many will be adults?
Thank you! Last problem and cant figure it out!

algebra  Vgpsa, Thursday, January 8, 2009 at 12:41am
VARIABLES
a = adults
c = children
p = people
GIVENS
a = (5/2)c
p = a + c
PLUG IN p&a, SOLVE FOR C
490 = (7/2)c
490 = (7/2)c
c = 140
SOLVE FOR A
a = 490  140 = 350
ANSWER
140 children
350 adults

algebra  Reiny, Thursday, January 8, 2009 at 1:04am
let number of adults be 5x
let number of children be 2x
then 5x+2x = 490
7x=490
x=70
so adults = 5x = 350
children = 2x = 140
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