2006-11-24 11:42:24 · 4 answers · asked by freddy197120032003 3 in Science & Mathematics ➔ Mathematics
73
The next one I think is 793
2006-11-24 11:47:05 · answer #1 · answered by rakesh18uk 2 · 0⤊ 0⤋
Let t = the original tens digit and o = the original ones digit.
Then the original number is 10t + o.
The digits reversed would be 10o + t.
So 10t + o + 1 = 2(10o + t).
10t + o + 1 = 20o + 2t
19o = 8t + 1
Then you just pick sample values of o, and solve for t, looking for integer answers.
19(0) doesn't work
19(1) = 8t + 1 -> 8t = 18, no dice
19(2) = 8t + 1 -> 8t = 37, no dice
19(3) = 8t + 1 -> 8t = 56, so t = 7
Therefore the number is 73.
2006-11-24 19:52:48 · answer #2 · answered by Jim Burnell 6 · 0⤊ 0⤋
73
2 x 37 = 74
2006-11-24 19:56:32 · answer #3 · answered by saddlesore 3 · 0⤊ 0⤋
It is 73
2006-11-24 20:45:54 · answer #4 · answered by alpha 7 · 0⤊ 0⤋