(2), 1. Let's assume that there are X people in the art group of Meilan Primary School, (20-x)/x=5/ 1.

2. If the length is 3x and the width is 2x, then 2*(2x+3x)=60, x=6 and the area is 12* 18=2 16.

The grain yield is 2 16* 1.2=259.2 (kg).

3. 10000*4.60%*( 1-5%)+ 10000= 10437

4. Set X package, 40: 18 = 30: X, x= 13.5.

5.3.14 * 2 * 2 *1.5 *1/3 *1.4 = 8.792, which is about 9.

6.( 1)40/0.25*0. 15=24

(2) Like table tennis: 40/0.25*0.3=48, like kicking shuttlecock: 40/0.25*0. 125=20,

48-20=28 (person)

(3) The favorite sport is table tennis, accounting for 30%, and the least one cannot be judged because of others, accounting for 22.5%.