Ammeter from parallel to series, current change

[Faris A]

Homework Statement

In the circuit shown, a student mistakenly connects a perfect ammeter(i.e. One of negligible resistance), in parallel with one of two identical resistors. The ammeter reads 0.40A.

What would the reading have been if he had correctly connected the ammeter in series with the two resistors? The cell also has negligible resistance.

Homework Equations

Relevant circuit (http://imgur.com/Uo6w6Um)

The Attempt at a Solution

I have no idea, the textbook says the answer is 0.20A but I have no idea why.

 

[Bystander]

I have no idea,

two identical resistors

Think about it.

 

[Faris A]

Thank you for pointing out the resistor, I didn't know very well how they worked and, going to do some research made me realize I waswrong in how I thought they worked. For anyone who also has the same question, try reading this.

(http://physics.stackexchange.com/questions/57581/how-exactly-does-a-resistance-reduce-current)