# Thread: single room double room

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## single room double room

like the technique shown below the point 47
for solving ratio question.

2. Good post? |
I donno short-cut but this is my method. I get B.
15 min is 1/4 hr
20 min 1/3 hr
1400 rooms * 1/4 = 350 hrs by 1 person
420 * 1/3 = 140 hrs by 1 person
Total 490 hrs by 1 person
Or 490/7 = 70 men for 7 hrs.

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20 minutes is 1/3 of hr or 2/3 ?

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Oops! My mistake. I corrected it in situ. To think the authors have an answer option to catch that.

5. Good post? |
I got B. 70 persons.

6. Good post? |
how suggest technique?

7. Good post? |
1 room by 1 person in 15mins
nin 7 hrs i.e. 420 mins one person can do 28 rooms
so to do 1400 rooms we need 1400/28=50 people
similary we get 20 people for 420 large rooms
ands 70

8. Good post? |
Imo B.

9. Good post? |
B
Total time required- (1400x15)+(420x20)=29400min
Total time available- 7x60 = 420min
No of persons required=29400/420 = 70 persons
(easy to calculate after omitting zeroes)

10. Good post? |
Originally Posted by blover
20 minutes is 1/3 of hr or 2/3 ?
20/60 = 1/3

Ans B - 70hrs

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