(There are 10 people in total * *).
(Because everyone can grow 3 acres of vegetables, and X people can grow 3 acres.
Similarly (10-x) people can grow 2( 10-x) mu of B vegetables.
This is because the income of a vegetable is 5000 yuan per mu, and the income of a vegetable is 3x * 0.5 =1.5x10 million yuan.
Similarly, 2( 10-x) mu of B vegetables can earn 2 (10-x) * 0.8 = (16-1.6x) yuan.
Because the total income should be no less than 6.5438+0.56 million yuan.
Then1.5x+(16-1.6x) ≥15.6)
1.5x+( 16- 1.6x)≥ 15.6
1.5x+ 16- 1.6x≥ 15.6
-0. 1x≥-0.4
x≤4