Translation:I go to the Welsh school twice a week.
Thanks a lot for clarifying the matter. I suppose that a similar variation might apply to the following two sentences in lesson 5: "Dyn ni'n hoffi yfed gwin ddwywaith y dydd." and "Dw i'n mynd nofio ddwywaith y mis.", where “twice daily” and “twice monthly” could perhaps be added to the acceptable answers?