36 yuan is needed to buy 4 bottles of disinfectant. How much does it cost to buy 6 bottles of disinfectant? How many bottles can Aunt Xiao bring 180 yuan buy?

54 yuan, 20 bottles.

1, buy four bottles of disinfectant to 36 yuan, indicating one bottle of 9 yuan.

2, buy 6 bottles of disinfectant is 6 times 9 equals 54 yuan.

3. If Aunt Xiao brings 180, that is, 180 divided by 9 equals 20, you can buy 20 bottles of disinfectant.