Our class voted for class treasurer. There are 20 students in our class. After voting for class treasurer, Billy received 3 times more votes than Keeton. How many votes did Billy receive?

Acompany that manufactures and sells guitars made changes in their product range. from the start they had 20 models. then they reduced the number of models to 15. as a result, the company enjoyed a 10% increase in turnover. - how much did the stock level change? in (%)