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John & David can do a piece of work separately in 30 and 20 hours respectively. In how many hours will they finish it working

By Kennedy

John & David can do a piece of work separately in 30 and 20 hours respectively. In how many hours will they finish it working together?

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Kennedy

write your experience with your pet how you met him in 300 words​

What is the formula for the circumference of a circle?

A. C=2πrA. C=2πr

B. C=πdB. C=πd

C. C=2π

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