.
Let "x" be the number of 10-cent coins.
Then the number of 5-cent coins is x also, and the number of 20-cent coins is (19-2x).
The "value" equation is
5x + 10x + 20*(19-2x) = 220 cents,
15x + 380 - 40x = 220,
-25x = 220-380 ---> -25x = -160 ---> x =
= there is no integer solution.
===> the problem formulation is incorrect OR the problem has no solution.
In any case, I regret about my time I spent for nothing solving it.
May be, the only sense is that other tutors will save their time after reading my answer.