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A battery had enough charge to light 10 bulbs for a certain period of time. After 10 minutes of usage, 2 bulbs were disconnected from the battery, All the balance bulbs remained powered up just as long as before. How long was that?

A battery had enough charge to light 10 bulbs for a certain period of time. After 10 minutes of usage, 2 bulbs were disconnected from the battery, All the balance bulbs remained powered up just as long as before. How long was that? Correct Answer 10 minutes

Given:

A battery had enough charge to light 10 bulbs for a certain period of time

Calculation:

Let be assume 10 bulbs will light to X minutes

⇒ 10X = 10 × 10 + 8(X - 10)

⇒ 10X = 100 + 8x - 80

⇒ 2X = 20

⇒ X = 10 minutes

∴ The required result will be 10 minutes.

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