Jim gets a $20 allowance per week plus $25 for every lawn he mows. if he made $345 in one week, how many lawns did he mow?

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

Complete the solution of the equation. find the value of y when x equals to 28 x+3y=28

Suzanne began a trip with 18 1/2 gallons of gas in the gas tank of her car if she hughes 17 3/4 gallons on the trip how many gallons does she have left once she finish the trip