Age Problems

These problems are all solved using one variable.

Age Problem 1  (age1.mp4) Intro to age problems; Tim is 9 years old and his great-grandma who he calls Nana, is 84 years old. In how many years will Nana be four times as old as Tim?

http://youtu.be/fBuI871RGdc

Age Problem 2  (age2.mp4): Amy is 50 years older than Don. In 20 years, she will be three times as old as Don. Find their current ages.

http://youtu.be/T-XlB9HP3T4

Age Problem 3  (age3.mp4): The sum of the ages of two cousins, Carlos and Maria, is 31 years. Three years ago, Carlos was four times the age of Maria. How old are they now?

http://youtu.be/-BfvefFW1Sw

Age Problem 4  (age4.mp4): The sum of the ages of an old dresser and a new dresser is 21. Nine years from now, the age of the new dresser will be the same as the age the old dresser was 8 years ago. Find the present age of each dresser.

http://youtu.be/fny-ySO2qWk