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The number of class A in a school is five more than two-thirds of class C. if 10 people from Class A are transferred to class C, class C will work twice as much overtime How many people are there in each class
The number of class C is X
The number of class A is 5 more than 2 / 3 of class C
A and C
2/3*x+5 x
If you transfer 10 people from Class A to class C, class C will work twice as much overtime
A and C
2/3*x+5 -10 x+10
Then x + 10 = 2 (2 / 3 * x + 5 - 10)
The solution is x = 60 2 / 3 * x + 5 = 45
There are 45 students in class A and 60 students in class C
Divide 100 people into four teams. The number of the first team is 4 / 3 of the number of the second team, and the number of the first team is 5 / 4 of the number of the third team. How many people are there in the fourth team?
Step by step, not equations!
If the first team is x, then the second team is 3 / 4x, and the third team is 4 / 5x. Suppose the fourth team is y x + 3 / 4x + 4 / 5x + y = 100, 51 / 20x + y = 100, X can only take the integral multiple of 20. When x = 20, y = 49, and x = 40, y = - 2 (wrong), so y = 49 can be used without equation
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