SOLUTION: HI, i need help with the last part. I understood most of it but i don't know how to get the final result.
1. It takes Mom, Dad and Isabel two hours to shovel their driveway a
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-> SOLUTION: HI, i need help with the last part. I understood most of it but i don't know how to get the final result.
1. It takes Mom, Dad and Isabel two hours to shovel their driveway a
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Question 1182436: HI, i need help with the last part. I understood most of it but i don't know how to get the final result.
1. It takes Mom, Dad and Isabel two hours to shovel their driveway after a snow storm. If Dad worked alone, it would take him 4 hours to shovel the entire driveway by himself. If Isabel worked alone, it would take her twice as long as Dad. How long would it take Mom to shovel the driveway herself?
- (Use the prime factorization of the known denominators to rewrite each term with a common denominator.)
Show your work Answer by ikleyn(52800) (Show Source):
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HI, i need help with the last part. I understood most of it but i don't know how to get the final result.
1. It takes Mom, Dad and Isabel two hours to shovel their driveway after a snow storm.
If Dad worked alone, it would take him 4 hours to shovel the entire driveway by himself.
If Isabel worked alone, it would take her twice as long as Dad. How long would it take Mom to shovel the driveway herself?
- (Use the prime factorization of the known denominators to rewrite each term with a common denominator.)
Show your work
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The three participants make of the job per hour (from the condition). It is their combined rate of work.
Dad makes of the job per hour, working alone (given).
Isabel makes of the job per hour, working alone (from the condition).
It means that Mom's rate of work is - - = - - = of the job per hour.
Hence, Mom will make the entire job in 8 hours.
ANSWER. Mom will make the entire job in 8 hours, working alone.
