I just did this is our math book at school, but what you do is find the GCF of the numbers. So list all there factors. 27=1x27, 3x9, and that's it. 36=1x36, 2x18, 3x12, 4x9, and that's it. So, next you see that highest numbers they both have in common, in this case it is 9. So your answer is, 9 pansies.
15
3 to the -1 power is -3
Then 5 to the -1 power is -5
-3 multiplied by -5 is 15.
Is it multiplication? If it is the answer could be 6x4 or 3x8
The answer to this question is 5 days