reasoning Maths Puzzle

A famous restaurant starts a special marriage anniversary promo to the couples on Thursdays who carry their proof of marriage...50% discount on meals only on Thursdays. A couple enters the restaurant on Thursday, tells the manager that they got married on a fine Sunday 28years back hearing this the manager chased away the couple without being served. Why?

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special package for married couples is only for couples who got married on thursday only,but thhe couple who came were married on sunday
10 years agoHelpfull: Yes(0) No(0)

reasoning Other Question

You are standing outside a basement door, Down the stairs, there are 3 light bulbs. Next to you, are 3 switches. You cannot see the lights from upstairs, and you must decide which switch controls which lightbulb by going downstairs once. How do you do this? There are 10 sets of 10 coins. You know how much the coins should weigh. You know all the coins in one set of ten are exactly a hundredth of an ounce off, making the entire set of ten coins a tenth of an ounce off. You also know that all the other coins weight the correct amount. You are allowed to use an extremely accurate digital weighing machine only once.
How do you determine which set of 10 coins is faulty?