標題:
Difficult Question
發問:
1.The total score of twenty-three students in a test is 2009 and no two students have the same score.Among them, the highest score obtained is 99 and the lowest score is A.Find the smallest value of A.2.Divide a certain number of pencils among students.If the pencils are distributed to classes A,B and C, each... 顯示更多 1.The total score of twenty-three students in a test is 2009 and no two students have the same score.Among them, the highest score obtained is 99 and the lowest score is A.Find the smallest value of A. 2.Divide a certain number of pencils among students.If the pencils are distributed to classes A,B and C, each will get 42 pencils;if distributed to class A only, each will get 105;if distributed to claa B only, each will get 98.If rhe pencils are distributed to class C only, how many pencils can each get?
最佳解答:
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1. NEXT TWENTY-ONE SCORE IS 98,97,96,….,78 98+97+96+95+…+78=(98+78)*21=1848 A=2009-99-1848=62 2. X=42A=105B=98C [42,105,98]=1470 SET X=42A=105B=98C=1470T THEN A=35T,B=14T,C=15T THEN X/(A+B+C)=1470T/(35T+14T+15T)=1470/64=735/32
其他解答:
hints: 1. 2009-99-98-97-...-78 2. x/a=105, x/b=98, x/(a+b+c)=42
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