Think of it this way: your friend is thinking of a year, and you have to guess which. She has told you the year is in the 20th century (1900s). There are 100 years in the 20th century (1901-1999 plus 1900). There can be 100 possibilities
Area of a rectangle=length×width. If the area is 161 and the length is 14 then that means: 161=14×width. You would then divide 161÷14 and you will find that the width is 11.5.
