could somebody help me with this question:-
it takes 30 minutes for 3 people to clean four identical rooms. How long would it take 9 people to clean 12 of the same rooms at the same rate
I find he Phrase "Same rate" confusing. My answer is 30 minutes but my teacher says it is 90 minutes and I can't understand why
This is how I did it:-
3 People = 4 rooms in 30 minutes
Divide LHS by 3 and multiply RHS with 3
1 People = 4 rooms in 90 minutes
multiply LHS by 9 and Divide RHS with 9
9 People = 4 rooms in 10 minutes
Multiply RHS with 3
9 People = 12 rooms in 30 minutes
Answer 30 Minutes
it takes 30 minutes for 3 people to clean four identical rooms. How long would it take 9 people to clean 12 of the same rooms at the same rate
I find he Phrase "Same rate" confusing. My answer is 30 minutes but my teacher says it is 90 minutes and I can't understand why
This is how I did it:-
3 People = 4 rooms in 30 minutes
Divide LHS by 3 and multiply RHS with 3
1 People = 4 rooms in 90 minutes
multiply LHS by 9 and Divide RHS with 9
9 People = 4 rooms in 10 minutes
Multiply RHS with 3
9 People = 12 rooms in 30 minutes
Answer 30 Minutes