You will subtract 345 from 12,420 36 times to arrive at zero. The easiest way to solve the problem is to divided 12,420 by 345.
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The number of times can you subtract 50 by 2 is 25
Only once, because after that you do not have 60 to subtract from!
Infinitely many times; you can always subtract 2 from whatever number you have in the series 9 - 2n.
a total of 25 times
Exactly 7 times.