Answers to last riddles

No answer came up to the last two riddles. All the same I have decided to come up with answer. Here they are:

1. Take 9 from 6, 10 from 9, and 50 from 40 and leave 6.

     How, can you please explain?

SIX - 9 (IX) = S
9 (IX) - 10 (X) = I
40 (XL) - 50 (L) = X

  = SIX

 

2. What is the value of 1/2 of 2/3 of 3/4 of 4/5 of 5/6 of 6/7 of 7/8 of 8/9 of 9/10 of 1000?

 

= i.e. 1/10 (all denominators will cancel out except 10 and 1 will remain as well as only numerator yet to be canceled out) of 1000

= 100

You can see, the two riddles are very simple.