The number between 20 and 30 that is equal to three times the sum of its digits is 27
How to determine the number?
The numbers between 20 and 30 are:
21, 22, 23, 24, 25, 26, 27, 28, 29
Add each digit of the numbers and multiply by 3.
So, we have
21 ⇒ 3 * (2 + 1) = 9
22 ⇒ 3 * (2 + 2) = 12
23 ⇒ 3 * (2 + 3) = 15
24 ⇒ 3 * (2 + 4) = 18
25 ⇒ 3 * (2 + 5) = 21
26 ⇒ 3 * (2 + 6) = 24
27 ⇒ 3 * (2 + 7) = 27
28 ⇒ 3 * (2 + 8) = 30
29 ⇒ 3 * (2 + 9) = 33
In the above computation, the true correct term of the sequence is
27 ⇒ 3 * (2 + 7) = 27
Hence, the number is 27
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