can someone help me to solve this physics word problem?

R1= 10ohm R2=20ohm R3=50ohm r4=?
R1, R2, R3, and r4 are connected in parallel across a 120V “power” supply to generate a current of 21Amps. The value of r4 is most nearly what ohms.
a) 0 b) 5 c) 10 d) 16 e) 100 a,b) 200 a,c) 300

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