Sammy and david were selling water bottles to raise money for new football uniforms. sammy sold 5 water bottles for every 3 water bottles david sold. together they sold 160 water bottles. how many did each sell?

How do you solve a question like this?

Scott’s bank account showed a balance of $750 on sunday. during the next five days, he made one deposit of $140 and numerous withdrawals of $180 each. let x represent the number of withdrawals that scott made. write an inequality that can be used to find the maximum number of withdrawals that scott could have made and maintain a balance of at least $100. do not use a dollar sign ($) in your response.

What is the surface area of a cube with the volume of 729 ft?