Qingqing grasslands organized an interest group. There are 8 people in calligraphy group and 24 people in painting group. There are two more people in the singing group than in the painting group.

24×( 1+2)÷8,

=24×3÷8,

=9 (times);

A: The number of people in the singing group is nine times that in the calligraphy group.

So the answer is: 9.