I solved a question:

Q1. Lindsay is twice as old as she was 10 years ago. Kimberly is half as old as she will be in 10 years.

Find Lindsay’s age now?

Find Kimberly’s age now?

Solution:

Let L = Lindsay’s age & K = Kimberly’s age

L=2(L-10)=>L=20

K=1/2(K+10)=>k=10

Now consider another question:

Q2. In 8 years Tiffany will be 3 times as old as she is now. The number of years until Tiffany will be 6 times as old as she is now.

I am using the same method, generating the equation:

T = 3(T+8)

But this is not correct. Some body guide me. The wordings of two questions are same but why same technique not working.

Zulfi.