How many teeth does a spur gear of module 16mm and a pitch circle diameter of 800m have?

Please Handwritten - Clear and organized - Mention Question # and Highlight Final answer- PLEASE ANSWER With fill work and steps please- THANK YOU

1. Two metric spur gears are engaged; the gear ratio is 3/2 and they have a module of 2.5 mm. Find the number of teeth for each gear if the center distance is 125 mm.

A spur gear set is cut with a hob. The spur gears have a pressure angle of 20 degrees and a diametral pitch of 16 teeth/inch. The pinion has 32 teeth while the gear has 80. The customer wants to replace the spur gear set with a custom helical gear set. The only requirements are: (1) the same hob must be used (2) the gear set center distance must remain the same (3) the gear ratio must remain the same. The designer has decided to use a helical pinion with 28 teeth. For the helical gear set, select the proper helix angle that will guarantee the three requirements. Report your answer in degrees, 3 decimal places.