Youtube videos by Julie Harland are organized at http://YourMathGal.com. Introduction to age problems. Shows how to use algebra to solve this age problem: 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?<br />For more great math videos visit: www.youtube.com/user/videosbyjulieharland/videos
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