You can put this solution on YOUR website! 9 men use 45 tissue papers in 6 days. How long would 70 tissue paper last for 7 men?
--------------------
9 men use 45 tissue papers in 6 days --> 1 man uses 5 papers in 6 days
1 man uses (5/6) papers per day.
7 men use 35/6 papers per day.
----
70 papers last 70/(35/6) days.
= 12 days
