Frustrating math question..?

There is this very frustrating math question that i need help on.. :S I have math in french so i put it trough an online translation system, so the words may not make a TON or sense together in english, but u can still kinda understand it

Three friends collect coins. Louis has 7 coins of less than the quintuple amongst coins which Jean has. It is necessary to add 28 coins to the quadruple amongst coins which Jean has to obtain the number of coins in the collection of Guillaume. Knowing that Louis and Guillaume have the same number of coins, the number of coins in the collection of Jean determines.

So yea, that’s it. I need to know the number of coins in Jean’s collection.
—THANKS!

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