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The three packages weigh a total of 15 pounds. The first package weighs twice as much as the second package.
The third package weighs three times as much as the second package. How many pounds does the first package weigh?
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f = 2*s, ( "The first package weighs twice as much as the second package." )
t = 3*s ( "The third package weighs three times as much as the second package." )
f + s + t = 15, or
2s + s + 3s = 15, or
6s = 15,
s = .
From this point please complete the solution on your own.