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Math·Algebra·Linear inequalities in one or two variables

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When several resistors are connected in series in a circuit, the total resistance of the circuit is the sum of the resistances of these resistors. A certain circuit consists of 9 resistors connected in series, where the resistance of each resistor is positive. The total resistance of 4 resistors in this circuit is 50 ohms. Each of the other 5 resistors in this circuit has a resistance of at most 20 ohms. The total resistance of this circuit is $x$ ohms. Which inequality best represents this situation?

A

$0<x\le 150$

B

$50<x\le 100$

C

$50<x\le 150$

D

$x\ge 100$