52 cards in a deck without the jokers
9 C of H in D I? 9 circles of hell in Dante's inferno.
The solution to the ditloid "50 d in a y" is "50 days in a year." A ditloid is a type of word puzzle where numbers and letters represent a phrase or saying. In this case, it refers to the number of days typically found in a year.
1 Hump on a Dromedary
60 Minutes in a Degree
180 degrees in a radian
28 Days in Four Weeks
1st March = Saint Davids Day Gavin.
The ditloid "24 D in W H C the M" stands for "24 hours in a day, which has a meaning." It references the number of hours in a full day.
December 21 the winter solstice
32 Degrees Fahrenheit at which Water Freezes
12 picture cards in a deck
4 Doors Per Car