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Working from the information provided in the question, it could be any number at all.
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What number when doubled has seven added and gives 13?
The number is 121/2.
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A natural number is doubled when added to its reciprocal. Find that number!
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Working from the information provided in the question, it could be any number at all.
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Answer: 11It's a list of prime numbersQ:.....since when is 9 a prime number?Answer: 17It's not a list of primes, it's not a Fibonacci sequence. The only pattern I see is that the last number in the sequence gets a number added to it to produce the next number in the sequence, the number that's added doubles each time. E.g. 2+1 = 3 (1 is added)3+2 = 5 (1 is doubled = 2, then added)5+4 = 9 (2 is doubled = 4, then added)9+8 = 17 (4 is doubled = 8, then added)
(143 - 21)/2
Doubling the numerator gives 2 × 9 = 18 To have a result of 1, the numerator and denominator must be the same. Thus the denominator needs to be 18. 18 - 16 = 2 → 2 must be added to the denominator.
What number when doubled has seven added and gives 13?
The number is eighteen.