Tavon has a gift card for $80 that loses $3.50 for each 30-day period it is not used. He has another gift card for $70 that loses $3 for each 30-day period it is not used.
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Expert's answer
2020-09-17T14:03:42-0400
80 - 3.50x ........ (i)
70 - 3x ..............(ii)
Set them equal;
80 - 3.50x = 70 - 3x
Solve for x. 80-70 =3.50x - 3x
10=0.50x
20=x
There will be 20 days out of the 30-day period until the cards will be equal in value.
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