A started a business with Rs.21,000 and is joined afterwards by B with Rs.36,000. After how many months did B join if the profits at the end of the year are divided equally?  Choose one: A) 4 B) 5 C) 6 D) 7 E) 8
Explanation:   Suppose 5 joined after x months   then,   21000*12=36000*(12-x)   =&gt; 36x = 180   =&gt; x = 5   Option 5
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A started a business with Rs.21,000 and is joined afterwards by B with Rs.36,000. After how many months did B join if the profits at the end of the year are divided equally?