I am trying to answer a question where I need to use the general formula for a voltage divider to find the voltage in.

I have rearranged the general formula as follows:

Vout = Vin * Rother / Rtotal

Vin = Vout * Rtotal/ Rother

but i can't come to the correct answer, could someone please tell me if this is due to my rearranging being wrong?

Thanks...