AboutSteve Holleran Expertise I can help with all math questions from basic math to Calculus.
Whether it`s consumer questions, or questions from high school or college students, I have probably dealt with it at some time in my career.
Experience 33 years teaching experience in NJ public schools
Education/Credentials B.S. Mathematics : Wake Forest University 1972
M.S. Mathematics : Monmouth University 1981
Expert: Steve Holleran Date: 5/6/2008 Subject: Algebra Problem Require Help
Question Weights of 2, 3, 5, and 7 pounds are not labeled. Using a balance scale. How many weighting do you need to determine what each weight is?
Please Show Work or explanation
Thank You Very Much For Your Help
Answer Hi Steve,
I would think you would need 4 weighings.
Pick two, weigh them , keep the heavier and set the lighter aside.
Pick one of the remaining two, balance it with the one from the first try, and keep the heavier. Since this is heavier than two items, it must be the 5 or the 7.
Weigh it with the remaining one, and the heavier has to be the 7. The other one is the 5, and then compare the two left over to determine the 2 and 3.
