SOLUTION: you have 250 dinners a child's plate costs $3.50 an adult's plate costs $7.00 a total of $1347.50 was collected how many plates [child and adult] were served?

Question 140700: you have 250 dinners
a child's plate costs $3.50
an adult's plate costs $7.00
a total of $1347.50 was collected
how many plates [child and adult] were served?
Answer by jojo14344(1513) (Show Source): You can put this solution on YOUR website!
Let's assigned "x"= child's plate and "y"=adult's plate.
So, x+y=250 right? (assuming all the 250plates were used)
Mark this equation 1.
Then when we multiply the child's plate "x" by $3.50) + (adult's plate "y" times $7.00)equals $1347.50. To show,
=$1347.50. Mark this equation 2.
In equation 1 we get , then substitute this "y" value in equation 2.
Therefore,
=$1347.50

, this is # of child's plate
For adult, go back equation 1, y=250-115
, # of adult's plate
In doubt? Simply check and go back equation 2,

$1347.50=$1347.50
Thank you,
Jojo
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