明天考试,谁告诉我怎么做。..

1. AT last year's Southern Florida Amateur Tennis Championships there were 1947 entries in the women's singles. this is a standard knockout tournament,so how many matches did the organisers have to arrange?

Answer: 1946

怎么算的.

2.European coins have denominations 0f 1, 2, 5, 10,20 and 50 cents,and 1and 2eurps. what is the smallest number of coins needed to pay exactly a bill of 127.87.

answer: 6

怎么做呢?

3. a person was pleased when a meal at the restaurant appeared to cost 28 for food and 16 for drinks. Unfortunately, her final bill added %15 alcohol duty, %10 service charge, %12 federal tax, %6 state tax,and %2 city tax. how much did she pay in tax,and what was her final bill?

answer: 11.68 and 61.25

怎么做呢?