Ollie, my friend, says:
"Take away "T" from this word and you will take away 63. Take away "T" and then replace the "S" with "L" and you will take away 59!"
What is that word?
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SEVENTY
Take away "T" from this word and you will take away 63.
SEVENTY - T = SEVEN Y which sounds like 7 why?
or better per Stiv,
taking away "T" means taking away the "TY" sound, leaving SEVEN (70 - 63)
Take away "T" and then replace the "S" with "L" and you will take away 59
SEVENTY - T & S → L = LEVEN Y which sounds like 11 (read quickly) why?
or, again thanks to Stiv,
adding "L" means adding the "EL" sound, ending as ELEVEN (70 - 59)
Ollie may clue
The Oliver 70 series of large agricultural tractors produced from 1935 to 1967.