ten commandments
4 Cardinal Points of the Compass
2 covers on a book
This is a Ditloid. The answer is 7 Colours in a Rainbow.
21 Consonants in the Alphabet
32 Degrees Fahrenheit is Freezing Point (of Water)
The ditloid "90 S in C A" stands for "90 Seconds in a Countdown." This phrase refers to the time duration used in various countdown scenarios, such as in games or competitions.
7 C in the W = 7 Continents in the World.
10 Christmas cards in a set of cards
10 Centuries in a Millenium
This is a Ditloid. The answer is 535 Members of Congress.
Could it be 50 Clues in the Quiz.