105
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210
105
The idea is to divide 210 / 3.
0.2
one half means divide by two-- that fact is worth remembering! 420 is especially easy to divide by 2, since all of the digits can be divided by 2. Divide 2 into 4 to get 2; divide two into 2 to get 1 and divide 2 into 0 to get 0, so the answer is 210.