What is the chance of selecting a girls name from a hat if ther are 15 girls names and 5 boys names ?

Precalculus question, image attached.

Solve each quadratic equation by factoring and using the zero product property. x^2 - 8x + 30 = 3x

At oaknoll school, 90 out of 270 students on computers. what percent of students at oak knoll school do not own computers? round the nearest tenth of a percent.