∵5× 1.5=7.5< 15,
∴x>5.
From "if the monthly water consumption of each household exceeds 5m3, the excess will be charged per cubic meter. 2 yuan Xiaoying's monthly water fee is not less than 15 yuan ":
5× 1.5+2(x-5)≥ 15，
Solution: x≥8.75,
∫ Tonnage is an integer,
∴x minimum is 9 cubic meters,
So Xiaoying's water consumption this month is at least 9 m3.
( 176-4x 10)÷4-2 ≥( 176-4x 10)÷xx≥4: 17。
Solution: the number of people going to Deqing is X, and the number of people going to Huaiji is Y,
According to the meaning of the problem, the equation is obtained:
To solve this system of equations:
The number of people going to Deqing is 133, and the number of people going to Huaiji is 67.
Solution: Let each shuttlecock be X yuan and each skipping rope be Y yuan.
Every shuttlecock 2 yuan, every skipping rope 3 yuan.