Go to google.com and type in the words ditloid answers.
This is a Ditloid. The answer is 13 Weeks to a Quarter.
Four roads to Glenamaddy
13 M of N = 13 moons of neptune.
13 Hearts in a Pack of Cards.
0 degrees longitude at Greenwich
This is a ditloid. The answer is 9 = gallons in a firkin.
Fifth-Generation Language
4 g in a cc is a ditloid, a type of word puzzle, each letter in the ditloid is the beginning of a word , you have the work it out, in this case the answer is Four Ghosts in a Christmas Carol.
10 Gallons in a Cowboy Hat
dirty harry's gun is a 44magnum
8 = Pints in a Gallon