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85.
The circuit to the right has a 10.0 volt battery.  
R3 is 2.50 ohms
R2 is 5.00 ohms
The ammeter between the battery and R1 reads 1.25  amps

What is the voltage drop across R1?
A. 0.63 volts                                  VT       10.0 volts
V = IR  =>  RT  =  ------ = ----------------- =  8.00 ohms
                                 IT         1.25 amps

   
RT =  R1  +  R2  +  R3

R1  =  RT  - R2  -  R3  =  8.00 ohms -  2.50 ohms - 5.00 ohms  =  0.50 ohms

V = IR  =   1.25 amps x 0.50 ohms = 0.63 volts

The Correct Answer is A.
B. 8.00 volts
C. 8.50 volts
D. 10.0 volts