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Alena and Estella can complete a job in 18 hours when they work together. If
they invite Tommy to help, how long will the job take? How many friends need to
work together on the job to complete it in 4 hours

Sagot :

Ilyons40idn

Answer:

Step-by-step explanation:

in direct proportion, if one quantity is increased or decreased then the other quantity increases or decreases, respectively. But in indirect or inverse proportion, if one quantity increases then other quantity decreases and vice-versa.

Image result for Alena and Estella can complete a job in 18 hours when they work together. If they invite Tommy to help, how long will the job take? How many friends need to work together on the job to complete it in 4 hours

Combined variation combines direct and inverse variation, y=kx/z.

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