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In an inverting op-amp circuit for which the gain is −4 V/V and the total resistance used is 100 kΩ. Then the value of R1 and R2 (negative feedback)

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In an inverting op-amp circuit for which the gain is −4 V/V and the total resistance used is 100 kΩ. Then the value of R1 and R2 (negative feedback)

(a) R1 = 20KΩ and R1 = 80KΩ

(b) R1 = 80KΩ and R1 = 20KΩ

(c) R1 = 40KΩ and R1 = 60KΩ

(d) R1 = 50KΩ and R1 = 50KΩ

This question was posed to me in exam.

This intriguing question originated from The Inverting Configuration topic in chapter Operational Amplifiers of Electronic Devices & Circuits

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Correct choice is (a) R1 = 20KΩ and R1 = 80KΩ

The best I can explain: Solve R1 + R2 = 100

R2/R1 = 4 for R1 and R2 respectively.

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