Question 166466: A local electronics store will sell 7 AC adaptors and 3 rechargeable flashlights for $84. what is the price of a single AC adaptor and a single reachargeable flashlight?
Answer by ankor@dixie-net.com(22740)   (Show Source):
You can put this solution on YOUR website! A local electronics store will sell 7 AC adapters and 3 rechargeable flashlights for $84. what is the price of a single AC adapter and a single rechargeable flashlight?
:
We know that the cost of 7 Adapters is a multiple of 7
and the cost of 3 flashlights is a multiple of 3, and together they add up to 84
Multiples of 7: 21, 28, 35, 42, 49, 56, 63
Multiples of 3: 21, 24, 27, 30, 33, 36, 39, 42, 45, 48, 51, 54
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Find the the multiple of each which add up to 84
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A little research reveals $21 for 3 flashlights, and $63 for 7 Chargers
:
$9 for a charger and $7 for flashlight
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