Hi, I have an exam in two days involving a few areas of math and unfortunately I haveNOTstudied for it at all (not something I usually do but I had other subjects that needed to be prioritised). Here is one of the problems I am having trouble with. If it's okay, I'd like to see a complete worked out example for future reference.

If A varies partly with B, and A=15 when B=2, and A= 27 when B= 5, find A when B=10

And I emphasize, any helpwillbe strongly appreciated!