Mohit and Rohit paint wall in 12 days and Rohit and Ashwini in 15 days Ashwini and Mohit in 20 days how much time will Rohit alone can finish the work?
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Mohit + Rohit = 12
in 1 day they will do = 1/12 part
Ashwini + Rohit = 15
in 1 day they will do = 1/15 part
Ashwini + Mohit = 20
in 1 day they will do = 1/20 part
together,
Mohit + Rohit + Ashwini +. Rohit + Mohit + Ashwini = (1/12 + 1/15 + 1/20) part
2( Ashwini + Mohit + Rohit) =12/60= 1/4
work --- time
1/4 ------. 1
1. --------. x
x = 1/1/4 × 1 = 1× 4 ×1 = 4
together = 4 days
Rohit = Total -(Ashwini + Mohit)
Rohit = 4 - 1/20 = 79 /20
in 1 day they will do = 1/12 part
Ashwini + Rohit = 15
in 1 day they will do = 1/15 part
Ashwini + Mohit = 20
in 1 day they will do = 1/20 part
together,
Mohit + Rohit + Ashwini +. Rohit + Mohit + Ashwini = (1/12 + 1/15 + 1/20) part
2( Ashwini + Mohit + Rohit) =12/60= 1/4
work --- time
1/4 ------. 1
1. --------. x
x = 1/1/4 × 1 = 1× 4 ×1 = 4
together = 4 days
Rohit = Total -(Ashwini + Mohit)
Rohit = 4 - 1/20 = 79 /20
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