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纠结..there are 200chickens and rabbit in all .but the number

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纠结..
there are 200chickens and rabbit in all .but the number of the chickens' feet is 56 less than that of the rabbits' feet.so there are____chickens and _____rabbits.
mr.li and 50 students planted trees on tree planting day .mr.li planted 5trees,each boy planted 3trees and each girl planted2trees.they planted 120trees,how many boys are there in this class?how many students are there in each class?
xinhua school holds a sports meeting.thirty - five students in grade three take part in the competition,the number of grade four students is three times more than that of grade three,and the number of grade five is 10more than the total number of grade three and grade four .how many studentsof grade five take part in it?
there are 135 students for three classes in grade 3.the number of students in class 2 is 5 more than that of class 1 :the number of students in class 3 is 7 less than that of class 2.how many students are there in each class?
my mother spent 1860 yuan on 20 tables and 30 chairs.each table costs 8 yuan more each chair.how much is each table and how much is each chair?
1 so there are _124_chickens and _76_rabbits.
小鸡和兔子加起来一共200只,所有小鸡的爪子加起来比兔子的少56个,问一共几只小鸡和兔子.(小鸡-124只.兔子-76只)
2 there are 15boys in this class.(第二个问题貌似有点毛病)
李老师在植树节带领50名学生一共种了120棵树.李老师种了5棵,男生一人种3棵,女生一人种2棵.问这个班一共几名男生,每个班各有多少名.(一共15名男生,35名女生)
3 185students of grade five take part in.
新华学校开运动会.三年级有35人参加,四年级的参加人数比三年级多3倍,五年级的参加人数比三年级和四年级总合多10人.问五年级一共几人参加.(五年级一共185人)
4 there are 44students in class 1,49 studens in class 42 in class 3.
三年级一共有135人,2班比1班多5名,3班比2班少7名,问各个班有几名学生.(一班-44,二班-49,三班-42)
5 34yuan for each chair,42yuan for each table.
妈妈花了1860元买了30把椅子和20张桌子,每张桌子比每把椅子贵8元,问一把椅子和一张桌子分别是多少钱(椅子-34,桌子-42)