Three fifths of a number is more than two fifths of it. 2. Find this number. (equation) there are 1180 people in the machinery factory. If you transfer one eighth of the male students, you will be recruited again There are 20 female workers. At this time, the number of men and women is equal. How many male workers were there in this factory? The first problem uses equation, the second problem does not use equation

Three fifths of a number is more than two fifths of it. 2. Find this number. (equation) there are 1180 people in the machinery factory. If you transfer one eighth of the male students, you will be recruited again There are 20 female workers. At this time, the number of men and women is equal. How many male workers were there in this factory? The first problem uses equation, the second problem does not use equation

3X/5-2X/5=2
X/5=2
X=10
X (1-1 / 8) = 1180-x + 20
X = 640

1. (2) 80% of a number is 12, and 15% of the number is () which requires a formula
3. A rope is 8 meters long, first subtract 1 / 4, then subtract 1 / 4, and there are () meters left

1. (50m) decreased by 20% to 40m;
40÷（1-20%）
=40÷80%
=50
2. 80% of a number is 12, 15% of this number is (2.25)
12÷80%x15%
=15x15%
=2.25
A rope is 8 meters long. First subtract 1 / 4, then subtract 1 / 4, and there are (9 / 2) meters left
8-8x1/4-（8x3/4x1/4）
=8-2-3/2
=9 / 2m

20% of a number is 60 less than 40%. To find this number, we need to synthesize the formula

60 (40% - 20%) = 300 if you can't understand, you can set the number as X, so you can list 0.4x = 60 + 0.2x, and then change it
Hope to help you

80% of a number is 48. What's 25% of the number

Let this number be X
80%x=48
x=48÷80%
x=60
60×20%=12
A: 25% of this number is 12