Problem solving (Show your calculations/steps)
1. A manufacturer packages soap powder in containers of three different sizes. The amount of soap powder in a full large container could fill exactly 3 of the medium containers or exactly five of the small containers. If an equal number of large and small containers are to be filled with the amount of soap powder that would fill 90 medium containers, how many small containers would be filled?[DBBL Probationary Officer-2011 : 2011]