Note that 1647/8235 = 1/5. Start with 1647/8235. First delete one digit from the numerator and one digit from the denominator leaving a fraction A/B which is equivalent to the fraction you started with. Then delete one digit from the new numerator A and one digit from the new denominator B leaving a fraction C/D which is equivalent to A/B. What is the value of the difference D - C
