A glass of tea costs 1,10 Euro.

The tea is 1 Euro more expensive than the glass.
How much is the glass?

Unless I've missed something, the glass costs 0.10 Euro and the tea costs 1.00 to make the tea + glass cost 1.10.

let the glass cost x euros

then the tea costs x+1 euros
x + x+1 = 1.1
2x = .1
x = .05 euros or 5 cents

glass costs 5 cents
tea cost 1.05
total = 5 + 1.05 = 1.1

Well, I missed something, didn't I? I wrote those equations, too, took one look at them, said to myself, "That's too simple" and jumped to the wrong conclusion of 1.00 and 0.1. So much for simple.

To determine the cost of the glass, let's break down the given information.

Let's assume the cost of the glass is represented by 'x' Euro.
According to the statement, the glass of tea costs 1,10 Euro, which is 1 Euro more expensive than the glass.

So, we can form the equation:
x + 1 Euro = 1,10 Euro

To get the cost of the glass, we need to isolate 'x' on one side of the equation. Let's solve the equation step by step:

x + 1 - 1 Euro = 1,10 - 1 Euro
x = 0,10 Euro

Therefore, the glass costs 0,10 Euro.