For number 1, the answer would be B, because 10^5 is 100,000 and 10^7 is 10,000,000, and if you divide 10,000,000 by 100,000, your answer is 100.
For number 2, your answer would be A, because 100,000÷10,000 is 10, and 6÷3 is 2. Then, you multiply 10x2 to get 20 as your answer.