Hello i need help solving this accumulated value problem, thank you.

6. You are given the following data on three series of payments (The pay- ments are made at the end of the year): Time 6 12 18 Accumulated Value at the end of Year 18 Series A 240 200 300 X Series B 0 360 700 X + 10 Series C Y 600 0 X Assume interest is compounded annually. Calculate Y