You can put this solution on YOUR website!
I'm assuming you mean Gita is half the age of Shila.
And finally,
Substituting,
Multiply both sides by 2.
Something is wrong with your problem setup.
All the solutions must be integers.
Check the setup and repost.
You can put this solution on YOUR website! No one can be "2 times younger" than someone else, since 1 times younger is zero (0).
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People with a shortage of brain cells should not compose math problems or math books.
They should run for president of the US.