How do you find the ratio of 95: 40

How do you use the elimination method for this question? explain, because i really want to understand!

Prove the divisibility of the following numbers: 25^9 + 5^7 is divisible by 30.also, read as (25 to the power of 9) + (5 to the power of 7) is divisible by 30. blank x 30what is the blank? ( it should be expressed in exponent form)

Olga bought a new skirt that cost $20. sales tax is 5%. how much did olga pay, including sales tax? 7.