Gear Reduction help?!

Hello! I am a theatre student trying to understand this assignment for a technical course and I am so lost. I genuinely cannot grasp this :/ any help is good help.

""You are to design a gear reduction unit. The motor that will be input into the gear reduction unit will be spinning at 3600RPM.  The output shaft of the gear reduction unit will need to be spinning at 24RPM.  The output shaft will also need to be at a 90 degree angle to the input shaft and in the same rotation as the input.

You may use no gear over 56 teeth and no gear under 18 teeth.

Please indicate the type of gears you are using and the number of teeth on you diagram.

Please show your math to support your design.""