Question

will give medal!

If a sprinkler waters 1/12 of a lawn in 1/2 hour, how much time will it take to water the entire lawn?

7/12 hour

1/6 hour

6 hours

10 hours

Answer 1

you know it does 1/12 of the lawn in half an hour, to get from half an hour to one hour, you must multiply it by 2
so you also multiply the amount the sprinkler has done by 2

this tells you how much you get done per hour

Answer 2

so we do 1/12 in half an hour, we want one hour
mulitiply amount done by 2 to get
2/12
which is 1/6

this is 1/6 done in one hour, therefore it will take 6 hours to complete

Answer 3

thanks @amorfide helped me a lot may have more questions is that okay?

Answer 4

okay

Answer 5

Sam measured the height of a window frame as 5.23 feet, but the actual height was 6 feet. What is the percentage of error in Sam's measurement?

6.79%

7.79%

11.23%

12.83%

@amorfide

Answer 6

if I had
30/100
and asked you to get the percentage you have, you would say 30%

so if you have 5.23/6
what percentage do you have?

then do 100% - answer

Answer 7

or alternatively, to get straight to the error

Answer 8

you can find the difference between the value calculated (5.23) and 6
then divide your answer by the actual answer (6)

so you would have

\[\frac{ 6-5.23 }{ 6 }\]

Answer 9

so it would be D) 12.83% @amorfide

Answer 10

yes well done