sugandha teaches the poor children every 9 day while her sister every 3 day when when will t h e y b e together to teach if the last thought on 13 April 2011
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1
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LCM of 3 and 9
= 9
So both of them will together teach after nine days.
13 + 9 = 22
So they will together teach on
22 April, 2011
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