SOLUTION: Michael can mow 2/5 of his yard in one hour. How many hours would it take for Michael to mow 9/10 of his yard? i do not under stand this question

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Question 998161: Michael can mow 2/5 of his yard in one hour.
How many hours would it take for Michael to mow 9/10 of his yard? i do not under stand this question
Found 4 solutions by CubeyThePenguin, ikleyn, greenestamps, josgarithmetic:
Answer by CubeyThePenguin(3113)   (Show Source): You can put this solution on YOUR website!
2/5 of his yard in one hour --> can mow the entire yard in 5/2 hours

of the lawn mowed in 9/10 hours
Answer by ikleyn(52832)   (Show Source): You can put this solution on YOUR website!
.

            What is written in the post by  @CubeyThePenguin  is nonsense.

            A correct solution and the correct answer is  THIS 


The time to complete the job is the job divided by the rate.


The job is   of the entire yard;  the rate is    of the yard per hour; hence the time is

     =  =  =  = 135 minutes = 2 hours and 15 minutes.    ANSWER

Solved.



Answer by greenestamps(13203)   (Show Source): You can put this solution on YOUR website!


After two wrong answers, you deserve a correct one....

2/5 of the lawn is 4/10 of the lawn.

9/10 of the lawn is 9/4 as much as 4/10 of the lawn.

4/10 of the lawn in 1 hour means 9/10 of the lawn is 9/4 times 1 hour, or 9/4 hours.

OR....

2/5 in one hour --> 5/2 hours to mow the whole lawn

5/2 hours to mow the whole lawn --> (9/10)(5/2) = 9/4 hours to mow 9/10 of the lawn

OR....

2/5 = 4/10 of the lawn in 1 hour --> 1/10 of the lawn in 1/4 hour, or 15 minutes.

1/10 of the lawn in 1/4 hour or 15 minutes --> 9/10 of the lawn in 9/4 hours or 15(9)=135 minutes

ANSWER: 9/4 hours, or 2.25 hours, or 135 minutes, or 2 hours 15 minutes.
Answer by josgarithmetic(39623)   (Show Source): You can put this solution on YOUR website!
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