Coal machine characteristics

This is not simple, the question is difficult, but one thing is certain, a couple usually consumes more water and electricity than one of the boys. Ideally, a boy and a boy in a couple use the same amount of electricity, and a girl will have a chance to use more water and electricity. However, after all, such opportunities cannot be calculated according to the amount of a man, and reference value can be drawn according to the actual situation. I suggest 3.5. For example, in this month's hydropower 350 yuan, two boys each paid 100, and couples paid 150.