Question 410882
Three rolls of streamers and 15 balloons cost $30. Later, you bought 2 rolls of streamers and 4 baloons for $11. How much did each roll of streamers cost?
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Equations:
3s + 15b = 30 dollars
2s +  4b = 11 dollars
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Multiply thru 1st by 4
Multiply thru the 2nd by 15
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12s + 60b = 120
30s + 60b = 165
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Subtract and solve for "s":
18s = 45
s = 5/2 dollars
streamers cost $2.50
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Cheers,
Stan H.
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