Math+Challenge+2

=**What is the mystery number?**=

I am less than 25. My ones digit is twice my tens digit. My digits add up to an even number. What am I?

=What Do You Need?=

What do you need to find a chosen number from this hundred square?



Four of the clues below are true but do nothing to help in finding the number. Four of the clues are necessary for finding it.

Here are eight clues to use: What is the number?
 * 1) The number is greater than   9.
 * 2) The number is not a multiple of   10.
 * 3) The number is a multiple of   7.
 * 4) The number is odd.
 * 5) The number is not a multiple of   11.
 * 6) The number is less than   200.
 * 7) Its ones digit is larger than its tens digit.
 * 8) Its tens digit is odd.

Can you sort out the four clues that help and the four clues that do not help in finding it?