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Homework Help Forum: math
Posted by lony on Tuesday, September 1, 2009 at 3:44am.
the digits of a certain number of 3 arithmetical digits are in arithmetical progression.Their sum is 15.And the number is 129 times the first digit.What is the number???
by using the formula..
please...
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- math - Damon, Tuesday, September 1, 2009 at 5:53am
n, n+1, n+2
3n+3=15
100n+10(n+1)+n+2 = 129n
n = 4
check
400 +50 +6 = 516 ? No
try
n, n+2, n+3
3n+5 = 15
n = 10/3 no
n, n+3, n+6
3n+9 = 15
n = 2
200 + 50 + 8 = 258 YES !
so number is
258
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