Aunt Wang

I bought 20 kilograms for the first time and spent it in 50 yuan.

I bought 20 Jin for the second time and spent 60 yuan.

A * * * bought 40kg and spent 1 10 yuan.

Aunt Zhang

I spent 100 for the first time and bought 40 kg.

The second time, I spent 100 to buy 33.33 (recycled) kilograms.

A * * * bought 73.33kg, which cost 200 yuan money.

1 10 divided by 40 equals 2.75.

200 divided by 73.33 equals 2.727.

This is the price per kilogram, and it is obvious that Aunt Zhang is suitable.

I wish you progress in your studies.