To find the difference between the number of people coming from State R with age group A and those coming from State Q with age group D, we need to analyze the information given in the pie charts. Assume that you have the numerical data corresponding to the percentages shown in the pie charts. Let’s proceed with the steps needed to solve this.

1. First, identify the total number of people migrating to Delhi from each state as presented in Pie-Chart-I. Assume those values in percentage (if the total Migrants are 'X', states P, Q, R, and S have their respective percentages of 'X').
2. Using Pie-Chart-II, determine the percentage of people corresponding to age group A from state R and age group D from state Q.
3. Calculate the number of individuals in each group:
   • Individuals from R in age group A: ( \text{Percentage of R} \times \text{Percentage of A within R} \times X ) \div 10000
   • Individuals from Q in age group D: ( \text{Percentage of Q} \times \text{Percentage of D within Q} \times X ) \div 10000
4. Compute the difference between these two calculated numbers to find the answer. Subtract the number of individuals from Q in age group D from the number of individuals from R in age group A.
5. Given that the correct answer is 8,000, this implies that the difference calculated from the pie charts' data equals 8,000.

This step-by-step approach ensures that you interpret and use the pie chart data correctly to solve questions related to distributions and differences.

By following these steps, you can solve any similar question involving calculating differences based on pie chart data.