谁能回答我两个英语问题The whole class form a circle.if we count the stu
谁能回答我两个英语问题
The whole class form a circle.if we count the students form the monitor in a clockwise direction,mary will be NO.17.if we count the students from the monitor in a counterclockwise students are there in the class?( )
Mary's grandfather says to her:"My birthday is the second Tuesday of May.There are 4 Tuesdays this May,and the sum of the four days is 58."The birth date of Mary's grangfather is( ),May
第一个问题：The whole class form a circle.if we count the students form the monitor in a clockwise direction,mary will be NO.17.if we count the students from the monitor in a counterclockwise direction.Mary will be No.21.How many students are there in the class?( ）
The whole class form a circle.if we count the students form the monitor in a clockwise direction,mary will be NO.17.if we count the students from the monitor in a counterclockwise students are there in the class?( )
Mary's grandfather says to her:"My birthday is the second Tuesday of May.There are 4 Tuesdays this May,and the sum of the four days is 58."The birth date of Mary's grangfather is( ),May
第一个问题：The whole class form a circle.if we count the students form the monitor in a clockwise direction,mary will be NO.17.if we count the students from the monitor in a counterclockwise direction.Mary will be No.21.How many students are there in the class?( ）
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NO.1:37 ,37=17+21 -2,for the two different counting,we count both monitor and Mary twice,there is an extra 2 here.
NO.2 :4 .May; Obviously,the dates for the same weekday like Tuesday is in sequential series,like it's Sunday on May 23,2010,so 16(23-7) and 30(23+7) of May are also Sunday.So let x be the first Tuesday of May,then the other 3 Tuesdays will be x+7,x+14 and x+21,then we have the following equation:
x+ x+7 +x+14 +x+21 =58,from which we can get x is 4
NO.2 :4 .May; Obviously,the dates for the same weekday like Tuesday is in sequential series,like it's Sunday on May 23,2010,so 16(23-7) and 30(23+7) of May are also Sunday.So let x be the first Tuesday of May,then the other 3 Tuesdays will be x+7,x+14 and x+21,then we have the following equation:
x+ x+7 +x+14 +x+21 =58,from which we can get x is 4
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