70. Create a pie chart for the number of people in three age groups of a tour group, where the central angle of the sector corresponding to the elderly is $9^{\circ}$ larger than that of the sector corresponding to children, the percentage of young adults in the total number of people is 5% higher than that of the elderly, and there are 9 more young adults than children. Then, the total number of people in this tour group is $\qquad$