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The fractions in the problem can be rewritten as ratio as
shown in the top half of the diagram.

The pink and green blocks are compatible, since 7 = 3 + 4.
But green and yellow blocks are not compatible (4 vs 7 in
the blue dotted box).

To make the units compatible, multiple the pink and green
blocks by 7 and the yellow blocks by 4. This gives us the
bottom diagram in which everything is expressed as units.

We see that Gabriel has 7u, Mark has 21u, Jordan has 8u
and Kenny has 20u. Clearly Kenny has to give Jordan 6u so
that they both have 14u.

Total money is 56u = 168, so u = 3.

Thus Kenny has to give Jordan 6u = 6 x 3 = $18 dollar.
(Please accept my answers if it is of help. Thanks!)
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