Tutors Answer Your Questions about Age Word Problems (FREE)
Question 1009327: Ramon is six times Jenny's age. In 12 years he'll only be twice her age. How old is Ramon? How old is Jenny??
Mandy is now twice Katy's age. In six years she will be 1 1/2 times Katy's age. How old is Katy? How old is Mandy?
Click here to see answer by stanbon(75887) |
Question 1009518: Half life/ decay question? Thank you!
I happen to have 10 pounds of the most radioactive material on Earth buried in my backyard. The half life of the material is 2345 years.
a.) How long will it take for 5 pounds of the material to decay?
b.) How long will it take for there to be 2 pounds remaining?
c.) How much is remaining after 1000 years?
Click here to see answer by josgarithmetic(39620) |
Question 1009815: Hi I am having problems completely solving this worded problem
Five years ago Stephanie was four times as old as her daughter Kate. In 15 years, Stephanie will be five times as old as Kate 2 years ago. Use simultaneous equations to determine Stephanie and Kate's current ages.
This is what I have worked out so far:
Stephanie= S, Kate= K
S-5= 4(K-5)
S= 4K-20+5
S= 4K-15 ... Equation 1
S+15= 5(K+15)
S= 5K+75-15
S= 5K+60 ... Equation 2
I think the next step is to substitute Equation 1 into 2:
4K-15= 5K+60
4K-5K= 60+15
-1K= 75 This is the point I get a bit stuck as if I divide both sides by
negative 1 the answer would be k= -75 which can't be correct as it
shouldn't be a negative number?
Any help would be much appreciated.
Click here to see answer by josmiceli(19441)  |
Question 1009815: Hi I am having problems completely solving this worded problem
Five years ago Stephanie was four times as old as her daughter Kate. In 15 years, Stephanie will be five times as old as Kate 2 years ago. Use simultaneous equations to determine Stephanie and Kate's current ages.
This is what I have worked out so far:
Stephanie= S, Kate= K
S-5= 4(K-5)
S= 4K-20+5
S= 4K-15 ... Equation 1
S+15= 5(K+15)
S= 5K+75-15
S= 5K+60 ... Equation 2
I think the next step is to substitute Equation 1 into 2:
4K-15= 5K+60
4K-5K= 60+15
-1K= 75 This is the point I get a bit stuck as if I divide both sides by
negative 1 the answer would be k= -75 which can't be correct as it
shouldn't be a negative number?
Any help would be much appreciated.
Click here to see answer by josgarithmetic(39620) |
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