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January 30, 2015

January 30, 2015

Posted by **chrissy** on Wednesday, October 10, 2007 at 9:34pm.

- math -
**tchrwill**, Wednesday, October 10, 2007 at 9:51pmbill is 2 years older than ted. in 5 years, 5 times ted's age will be 4 times bill's age. how old is ted?

B = T + 2

4(B + 2) = 5(T + 2)

Can you take it from here.

- math -
**Quidditch**, Wednesday, October 10, 2007 at 9:52pmlet x=Bill's age, y=Ted's age

Bill is two years older than Ted. This gives the first equation:

y=x-2

In 5 years, their ages will be:

Bill=(x+5), Ted=(y+5)

and...

4*Bill's age=5*Ted's age

4*(x+5)=5*(y+5)

Use the first equation to substitute for y in the second equation. Then, you will only have x's. Solve for x. Plug the solved value for x into the first equation to easily find y.

- math -
**Patrick**, Wednesday, October 10, 2007 at 9:52pmBill is 2 years older than ted

(1) b = t + 2

where b = bill's age TODAY and t = ted's age TODAY

In 5 years 5 times ted's age will be 4 times bill's age:

(2) 5(t+5) = 4(b+5)

Put equation (1) into (2) for b.

5(t+5) = 4(t+2+5) ==> 5t+25 = 4t+28

solve for t to get t = 3

So ted is 3 and bill is 5 years old.

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