Find the NumberMath brain teasers require computations to solve.
The number has 5 digits.
a: the first and the third digit are the same, all others are different.
b: the highest digit is 7 and the lowest is 1.
c: the third digit is twice as much as the fourth.
d: the second digit is higher than the fifth.
e: the sum of the five digits is 23.
What is the number?
Because of 'a' and 'c' there are three possibilities:
2-21- (with 7 and 6 we only get 18)
4-42- (with 7 and 1 (b) we get 18)
6-63- (b says we need a 7 and a 1, and d shows the position.)
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