Jacob is 10 years younger than twice mary's age. jacob is 32 years old. how old is mary?

There were 816 people at a concert when a band started to play. after each song, only half the people stayed to hear the next song. how many people were left at the concert after x songs? write a function to represent this scenario.

Problem fathi wants to print out a pdf document that is 48 pages long. to save paper, he decides to print on both sides of each sheet and to print two pages on each side of the sheet. how many sheets of paper will he need?

The sum of the squares of two numbers is 8 . the product of the two numbers is 4. find the numbers.