Problem:	To solve this problem...
What is the starting number?	Work backwards. What number when you subtract 2 from it gives you 18?. After you answer this question, then work backwards until you arrive at the ?.

Enter your answer:
Your answer may be in any of the following forms:

• Integer (positive,negative,zero)
• Decimal (must be accurate to 4 places)
• Fraction (e.g., '3/4')
• Mixed number (e.g., '4 3/4')
• Scientific notation (e.g., '1.2e-02')
• Single words, correctly spelled (e.g.,'isosceles')