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He or she would be 16 or 17 years of age.
avg of 30 is 16=30*16=480 avg of 30 and 1 teacher is 17=31*17=527 Save then age of teacher is 527-480=47...
17+19+23 = 59 Jim is 19 Ken is 17 Fred is 23
Tony is 12! because if his brother is 17 there would be 5 years difference between their agaes and 12+17=29!
Genesis 17:17 says Sarah had Isaac when she was 90 years old