Suppose Ruth Ann has 3 routes she can choose from to get from school to the library, and 5 routes from the library to her home. How many routes are there from Ruth Ann’s school to her home with a stop at the library?
A. 9

B. 60

C. 15

D. 25

Question

Suppose Ruth Ann has 3 routes she can choose from to get from school to the library, and 5 routes from the library to her home. How many routes are there from Ruth Ann’s school to her home with a stop at the library? 
 A. 9  
 
 B. 60  
 
 C. 15  
 
 D. 25

anonymous · Answer

by the counting principle it is the product of the number of choices for each trip so $3\times 5$

anonymous · Answer

15 , thanks :)

anonymous · Answer

this problem is like 1000 times easier than the last one
what is up with that?

anonymous · Answer

15

anonymous · Answer

this one you had to multiply three times five
last one you had to compute a bunch of areas 
a bunch of ratios
then multiply 
then add

anonymous · Answer

i have no idea , that's what they always seem to do , knowing my luck the next one wont be easy lol