what is 3 2/5 divided by 10/12?

Question

Please help,     I don't know how to do these types of problems?

also how do you convert a recipe that calls for 1/4 of something for 12 people but I need to make the recipe for 30. I know that 30 is equal to 12 x  2 1/2 but I don't know how to figure out the 2.5 x 1/4 ?

Thank You!!!!!!

Answer 1

(3 2/5) / (10/12)=(12/10) * (3 2/5)

=(12/10) *(17/5)

=204/50

=102/25