解下列奥数题:答对者给予80分奖励!加油!
解下列奥数题:答对者给予80分奖励!加油!
1.某次猜谜语比赛,谜语按难易分两类,每人可以猜三条.每猜对一题较难的谜语得3分,每猜对一条较容易的谜语得1分.如果有8人得1分,7人得2分,6人得3分,5人得4分,4人得5分.恰好猜对两题谜语的有几人?
2.A certain make of pen(一种牌子的钢笔)was priced 50 cents in the store but found few buyers. Then the store had reduced the price (减价,降价),the whole remaining stock (存货)was sold for $31.93. What was the retuced price?
3.If r and s are integers,each greater than 1, and if 11(s—1)=13(r—1),what is the least possible value (最小值)of +s?