An apple is 40 cents, a banana is 60 cents and a grapefruit is 80 cents. How much is a pear?Riddle Answer
You need to check that your friend, Bob, has your correct phone number, but you cannot ask him directly. You must write the question on a card and give it to Eve who will take the card to Bob and return the answer to you.
What must you write on the card, to ensure Bob can encode the message so that Eve cannot read your phone number?Riddle Answer