If the price of lemon should be the same during all sale and can't be changed, then we have the next equation:
20x = 40x = 60x = 80x = 100x, where x is the price of lemon.
In this case the only solution is: x = 0.
If it is possible for all brothers to change the price at least once to the same level, then let the first price is $1 per bundle of 5 lemons (or $0.2 per lemon) and $1 per lemon for the remaining.
First son: $1*0 bundles + $1*20 lemons = $20,
Second son: $1*5 bundles + $1*15 lemons = $20,
Third son: $1*10 + $1*10 = $20,
Fourth son: $1*15 + $1*5 = $20,
Fifth son: $1*20 + $1*0 = $20.
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