Elementary school students spend 1/6 of their day at recess on average. if they are in school 6 1/2 hours a day, how much time is spent at recess?

Pls! does anybody know a shortcut for answering these types of questions in the future?

Simplify the expression. -2/5(10+15m-20n)

Four individuals pool money together to start a new business and agree to split the profits equally. n invests $6,000, x invests $2,000, y invests $8,000 and z invests $4,000. if the profits for the first month were $100,000, y receives than if the profits were divided in proportion to how much they invested.