1 Sam ran 2 laps for every 5 laps run by Billy. If Sam ran 20 laps, how many laps did Billy run? ​

Pls , the question is in the picture!

The radius of the circle is 4 cm and the measure of the central angle is 90° the area of the sector with a central angle measuring 90° and radius of length 4 cm is vt cm the triangle in the sector is 4 cm the area of the triangle is v/cm² the area of the segment of the circle is (471 - ) cm?

What can you determine about the solutions of this system