Problem:	To solve this problem...
My grandfather's farm has pigs and chickens. I counted 38 heads and 108 feet. How many chickens did he have?	See the guess-and-check notes to find out how to solve guess-and-check problems. Your columns should be "pigs","chickens", "no. feet", and "number heads".

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')