If $a = 2^b c$ and $b = 3$ and $c = 5,$ what is $A?$

Calculate:

$$\frac{6 \times 5 \times 4}{3 \times 2 \times 1}$$

All but one of these rings of 6 beads can be obtained from the others by rotating or flipping over the ring. Which is the unusual one?

When buying a certain model of phone, there are $3$ colors to choose from, and $3$ different amounts of storage to choose from. How many different combinations are there for that phone model?

Jenny has $3$ skirts, $2$ pants, and $4$ shirts. How many ways can she create an outfit with one of the shirts, and either a skirt or pant?

Everybody in a certain middle school takes French, Spanish, or both. The French teacher has a total of $90$ students, and the Spanish teacher has a total of $110$ students. There are $20$ students in both languages. How many students are at the school?