SOLUTION: Hello, I am studying for a test and I can�t figure out how to solve this: Danny needs to send 4 packages of different weights. The cost of the stamps depends on the weight of th

Question 1021671: Hello, I am studying for a test and I can�t figure out how to solve this:
Danny needs to send 4 packages of different weights. The cost of the stamps depends on the weight of the package. The most expensive stamp costs 3 times more than the cheapest stamp. All together he paid 120 dollars. How much is the cheapest stamp and how much is the most expensive?

We are learning an = a1+d(n-1)
Answer is 15 and 45
Thanks!

Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!

So then,

You also know,

Substituting,

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