Pressure formula of the third year of junior high school What about the pressure

Pressure formula of the third year of junior high school What about the pressure

Formula: P = f / s p-pressure Pascal f-pressure Newton s-stressed area square meter f = PS (pressure = pressure × stressed area) s = f / P (stressed area = pressure △ pressure)
In the liquid; P = ρ liquid

Who knows the formula for the pressure of an object on an inclined plane

F = PS P = f / s let the angle between gravity and component force (pressure n) be x, then p = gcosx / s

The numerator of 2007 out of 2008 minus a number, and the denominator plus this number, the score is two-thirds, what is the number?
The quotient of 4.2 is equal to three fifths

1. Let the number be X
(2007-x)/(2008+x)=2/3
3（2007-x）=2（2008+x）
5x=3x2007-2x(2007+1)
x=401
2. 4.2 / x = 3 / 5
The solution is 3x = 21, x = 7