Jamie is 3 times as old as her sister penny .in 2 years jamie will be twice as old as penny .how old are jamie and penny now

Well i think this is right;

If jamie is 3 times Pennys age, and in two years he is twice as old as her i would say she is 2 because; 2 * 3 = 6

2 years later Penny would be 4, because she was 2 at the time. And because Jamie was 6 he will become 8. That means he was three times her age. And then in two years twice his age. 

So now Jamie is 8 and Penny is 4.
Hope that helps!

Polar coordinates is 8,9