Intermediate June 2017 Unit 1 Q14

14. A whole number is written on a card.
You are given three clues to help you work out the number on the card.

Clue 1 :  Double the number is between 8 and 18 inclusive.

Clue 2 :  The number is a prime number.

Clue 3 :  The number is not a factor of 100.

What is the number on the card?
You must show all your working. [3]

The number on the card is ……………………………