Sally can paint a room in 4 hours while it takes steve 9 hours to paint the same room. how long would it take them to paint the

Question

umka2103 [35]

3 years ago

14

Sally can paint a room in 4 hours while it takes steve 9 hours to paint the same room. how long would it take them to paint the

room if they worked together

Mathematics

1 answer:

Eva8 [605] · Answer 1 · 2022-08-11T15:48:14+03:00

Eva8 [605]3 years ago

7 0

Sally ⇒
4 hours = 1 room
1 hour = 1/4 of the room

Steve ⇒
9 hours = 1 room
1 hour = 1/9 of the room

Sally + Steve ⇒
1 hour = 1/4 + 1/9 = 9/36 + 4/36 = 13/36

Number of hours needed ⇒
1 ÷ 13/36 = 1 x 36/13 = 36/13 = 2 10/13 hours

Answer: They need 2 10/13 hours.