SOLUTION: What number between 20 and 30 is four times the sum of it's two digits?

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Question 587367: What number between 20 and 30 is four times the sum of it's two digits?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
The number has to begin with 2
Let the units digit = n
The value of the number is +2%2A10+%2B+n+
given:
+20+%2B+n+=+4%2A%28+2+%2B+n+%29+
+20+%2B+n+=+8+%2B+4n+
+3n+=+20+-+8+
+3n+=+12+
+n+=+4+
The number is 24
check:
+4%2A%282+%2B+4%29+=+24+
OK