Discussion
If in a coding system, 28374 is coded as 4166148, then in the same coding system, the number 19351 is coded to :
Answer: C
19351 is coded as 2186102.
Each digit is doubled and the results are written side by side. For 28374: 2 to 4, 8 to 16, 3 to 6, 7 to 14, 4 to 8, giving 4 16 6 14 8 = 4166148.
For 19351: 1 to 2, 9 to 18, 3 to 6, 5 to 10, 1 to 2, giving 2 18 6 10 2 = 2186102.
2186211 and 2180619 go wrong in the last digits, and 2816620 reorders the digits.
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