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answer of the first exercise

1) For this typical french meal :  Yvette ate 6 snails and 8 frogs. Jean-Claude ate 4 snails and 12 frogs. Ginette ate 3 snails and 2 frogs. Gérard ate 5 snails and 3 frogs. And Gertrude ate 4 snails and 3 frogs. At the end of  the evening 22 snails and 28 frogs were eaten. 2) We know that 2 snails cost 3 euros and 1 frog costs 2 euros so : 2 x 28 = 56 euros 2 snails = 3 euros 22 sanils =? --> (22 x 3) / 2 = 33 euros The result is 33 + 56 = 89 euros The family must pay 89 euros for Christmas

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