Definition
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Ugain
Ugain yw'r rhif sy'n dilyn nineteen a chynharach na thirty.
Twenty is the number that follows nineteen and precedes thirty.
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Mae gen i ugain o ddoleri yn fy nghyfrif.
I have twenty dollars in my account.
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Mae'r arholiad yn para ugain munud.
The exam lasts twenty minutes.
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Mae yna ugain o bobl yn y gystadleuaeth.
There are twenty people in the competition.