Wife Hypothiroidism problem(Help)

[thisAngelBites]

At the same time she is taking 50 mcg of Levothyroxine/Levotironina that equals the dose of 100mcg/20 mcg .

I understand how 2 doses of 50 mcg levothyroxine equals 100 mcg - but where did you get the 20 mcg from? I just need to be really clear on what she is taking.