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balandron [24]
3 years ago
14

Will mark brainliest

Mathematics
1 answer:
Free_Kalibri [48]3 years ago
7 0

Answer:

it is the same

Step-by-step explanation:

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Twin brothers, Billy and Bobby, kid mother grandparents lawn together for 60 minutes. Billy could mow the lawn by himself in 20
Dovator [93]

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Bobby around 131 minutes and Billy around 111 minutes

Step-by-step explanation:

To solve the problem it is important to raise equations regarding what happens.

 They tell us that Billy (Bi) and Bobby (Bo) can mow the lawn in 60 minutes. That is to say that what they prune in a minute is giving as follows:

1 / Bo + 1 / Bi = 1/60 (1)

They say Billy could mow the lawn only in 20 minutes less than it would take Bobby, therefore

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1 / Bo + 1 / (Bo-20) = 1/60

Resolving

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Rearranging:

Bo ^ 2 - 140Bo -1200 = 0

Now applying the general equation

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