a men or b women (or goats/sheep) do it in d days: days for a mix of both

The same question, asked 3 times: CDS 2 2017*, CDS 2 2019*, CDS 1 2022. Every wording below, oldest first.

Try each one first, then open its answer.

Question 1
CDS 2 2017
38 $4 goats or 6 sheep can graze a field in 50 days. 2 goats and 3 sheep will graze it in$
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Question 2
CDS 2 2019
36 $A field can be reaped by 12 men or 18 women in 14 days. In how many days can 8 men and 16 women reap it ?$
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Question 3
CDS 1 2022
27 $8 men or 12 women can do a piece of work in 24 days. In how many days can the work be done by 8 men and 12 women?$
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Question 1