设甲班原有x人,则乙班原有(78-x)人
3/7x+(78-x)×2/6=30
3/7x+26-1/3x=30
2/21x=30-26
x=4÷2/21
x=42
乙班原有人数:78-42=36人
甲乙两班共有78人,甲班人数的7分之3和乙班人数的6分之2共有30人.求原来两班各有多少人
甲乙两班共有78人,甲班人数的7分之3和乙班人数的6分之2共有30人.求原来两班各有多少人
数学人气:868 ℃时间:2019-10-10 00:57:14
优质解答
我来回答
类似推荐
猜你喜欢
- 1形容词,名词加在哪
- 2He likes to walk
- 3某定值电阻两端加5伏电压时通过该电阻的电流
- 4已知数列{an}的前n项和Sn=5^n+t,则{an}为等比数列的充要条件是
- 5there will be schools in future 一般疑问句 _____there______ ______in the future
- 6Not only ____has_the car he ___has__been sold by his son for gambling debts,but also his new house
- 7do you want to go to the movies
- 8标有“6V 6W”的灯泡,如果接在电压是15V的电路上并使其正常发光,应_联一个阻值为_欧姆的电阻.
- 9设集合A={1.1+m.-2},B={1.n,n的平方},且A=B,求m,n的值
- 10高二英语suggest that sb should do