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Dan's fish weighed four times as much as Paul's fish,
and Jose's fish weighed half as much as Dan's fish.
the three fish weighed 21 pounds.
Let paul's fish weigh x lb
dan's fish = 4x
Jose's fish = 1/2 * 4x= 2x
x=3 lbs . paul's fish
4x= 4*3=12 lbs Dan's fixh
2x = 2*3 = 6 lbs Jose's fish
3+12+6 =21 lbs