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Additive years (Posted on 2012-08-08) Difficulty: 3 of 5
A year is called an Additive year when the sum of the number formed by the first two digits and the number formed by the last two digits add up to the number formed by the middle two digits. For example, considering the year 1978 we observe that when 19 is added to 78, the result is 97 which is the number formed by the middle two digits.

(i) Determine the total number of Additive years from years 1000 to 9999 inclusively.

(ii) What are the respective first and last Additive years from years 2000 to 2999 inclusively?

(iii) What are the respective first and last Additive years in the period covered under (i)?

No Solution Yet Submitted by K Sengupta    
Rating: 5.0000 (1 votes)

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  Subject Author Date
Hints/Tipsre(2): formulae + answersAdy TZIDON2012-08-09 10:02:41
re: formulae + answersMath Man2012-08-08 22:58:21
Solutioncomputer solutionCharlie2012-08-08 12:38:33
Solutionformulae + answersAdy TZIDON2012-08-08 12:14:32
Solution (cont.)Chris, PhD2012-08-08 11:37:06
SolutionSolutionChris, PhD2012-08-08 11:22:57
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