Numeral adjective triakonta (thirty) in the Gospels-Acts

(Translation from NRSV with a few modifications for a more literal meaning)

Matthew

13: 8Other seeds fell on good soil and brought forth grain, some a hundredfold, some sixty, some thirty (triakonta).
13: 23But as for what was sown on good soil, this is the one who hears the word and understands it, who indeed bears fruit and yields, in one case a hundredfold, in another sixty, and in another thirty (triakonta)."
26: 15and said, "What will you give me if I betray him to you?" They paid him thirty (triakonta) pieces of silver.
27: 3When Judas, his betrayer, saw that Jesus was condemned, he repented and brought back the thirty (triakonta) pieces of silver to the chief priests and the elders.
27: 9Then was fulfilled what had been spoken through the prophet Jeremiah, "And they took the thirty (triakonta) pieces of silver, the price of the one on whom a price had been set, on whom some of the people of Israel had set a price,

Mark

4: 8Other seed fell into good soil and brought forth grain, growing up and increasing and yielding thirty (triakonta) and sixty and a hundredfold."
4: 20And these are the ones sown on the good soil: they hear the word and accept it and bear fruit, thirty (triakonta) and sixty and a hundredfold."

Luke

3: 23Jesus was about thirty (triakonta) years old when he began his work. He was the son (as was thought) of Joseph son of Heli,

John

5: 5One man was there who had been ill for thirty (triakonta)-eight years.
6: 19When they had rowed about twenty-five or thirty (triakonta) stadia, they saw Jesus walking on the sea and coming near the boat, and they were terrified.