If you mean 40% of the circle with the rotation at the center of the circle, then you do this:
Measure of circle: 360°
Amount of circle's measure: 40%
360 * 40% = 144°
Thus, to take up 40% of the circle you need to have an angle measure of 144°.
First step is Add 3 to both sides
hope it helps
360 is the anwer because i multipled 40 white cars by 9 times yellow car to get answer 40×9=360
4x+30=2(x-10)
4x+30=2x-20
4x-2x= -30-20
2x= -50
x= -25
Mark as brainliest if you find it helpful.