Discussion
In a certain code the numbers are coded as follows: '325' is coded as '105' '436' is coded as '137' and '547' is coded as '169'. What will be the code for 258?
Answer: B
258 is coded as 157.
The code is made of two parts written side by side: the sum of all three digits, followed by the sum of the first two digits.
| Number | Sum of all digits | Sum of first two | Code |
|---|---|---|---|
| 325 | 10 | 5 | 105 |
| 436 | 13 | 7 | 137 |
| 547 | 16 | 9 | 169 |
| 258 | 15 | 7 | 157 |
For 258, the digits add to 2 + 5 + 8 = 15 and the first two add to 2 + 5 = 7, giving 157. The other options do not fit the rule that produced all three given codes.
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