Question: can anyone help me solve these two questions please when...
Question details
Can anyone help me solve these two questions please...
When solving any
problem please be as thorough as possible. Write down EACH step and
explain (in plain English) what you did.
Make sure you EXPLAIN why you think your answer is correct. Just
stating the answer is NOT a good submission.

I think of a positive number, multiply it by 4, add
six, and then divide the answer by 2, and square the result. Then I
subtract 9, and divide the result by the number I first thought of.
My answer is 20. What number did I think of?
 It takes you 30 seconds to walk from the first (ground) floor of a building to the third floor. How long will it take to walk from the first floor to the sixth floor (at the same pace, assuming that all floors have the same height)?