The number of girls in class 62 accounts for 5 / 6 of the number of boys. After the transfer of two girls, there are 42 students in the whole class. What is the number of girls now?

The number of girls in class 62 accounts for 5 / 6 of the number of boys. After the transfer of two girls, there are 42 students in the whole class. What is the number of girls now?

3/4
If there are x girls and Y boys, then:
X/Y=5/6
X+Y-2=42
The solution is x = 20
Y=24
Now there are 20-2 = 18 girls, 18 / 24 = 3 / 4 boys
How to cut 45 degree angle of round pipe
Draw a square with the diameter of the pipe as the side length at the place where you want to cut the pipe, and draw a diagonal line to make the diagonal line consistent with the direction you want to cut. Just cut according to the diagonal line. This method is simple and practical, but it must have a certain foundation, otherwise there will be some errors
How can I do 1.25 times 4.34 times 0.5 in a simple way
1.25*4.34*0.5=1.25*4*4.34*0.5*2/8=5*4.34/8=2.7125
The number of boys in class 6 (1) is three fifths of the number of girls, and the number of girls accounts for a few percent of the total number of the class
The original price of a color TV is 2500 yuan, but the current price is 2400 yuan, which is reduced by several percent
(2500-2400) divided by 2500 is 4% lower than a color TV
The numerator of female students in the class is 5, and the denominator is 5 + 3 = 8
What kind of water is used for cooling water of 45 degree angle cutting machine
Cutting fluid can keep the cutting edge sharp and cool
A simple method of multiplying 39 by 49
39×49
=39×(50-1)
=39×50-39×1
=1950-39
=1911
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The number of girls in class 6 (1) is four fifths of the number of boys, the number of boys is a fraction of the number of girls, and the number of girls is a fraction of the number of the whole class
The number of boys is 5N / 4N, so the number of girls is 5N / 4
4n/(4n+5n)=4/9.
Geometric problems (on acute trigonometric functions)
If a * Sina + cosa = 1, b * Sina cosa = 1, then a * b =?
Sort out the equation and get the conclusion
a=(1-cosA)/sinA,b=(1+cosA)/sinA
A * b = (1-cosa) * (1 + COSA) / the square of sina
=(1-cosa Square) / Sina square
=1
The calculation process of 0.25 times 39 plus 3 / 4 times 25 plus 26 / 4 times 3 / 13 by simple method
0.25x39+3/4x25+26/4x3/13
=1/4x39+1/4x3x25+1/4x26x3/13
=1/4x(39+75+6)
=1/4x120
=30
There are 26 boys and 24 girls in class 51. What's the percentage of boys and girls in the class?
26 ÷ (26 + 24) = 26 / 50 = 13 / 25
24 ÷ (26 + 24) = 24 / 50 = 12 / 25