A and B can polish the floors of a building in 25 days. A alone can do 1/3 of this job in 15 days. In how many days can B alone polish the floors of the building?
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A & B CAN POLISH THE FLOOR in 25 days
A DOES 1/3 OF HIS JOB IN 15 DAYS
B = ?
LET 1ST PERSON BE x AND 2ND PERSON BE y
X AND Y TOGETHER CAN FINISH A WORK IN 25 DAYS.
ONE DAY WORK OF X AND Y = 1/25
ONE Day WORK OF X
WORK..........DAYS
1/3--------------- 15
1 ------------------ x
( cross multiplication )
x = 45
one day work of x & y = 1/25
x + y = 1/25
1/45+ y = 1/25
at last after taking 1/45 to the other side and after taking LCM
y = 4/225 = 56 1/4 days
A DOES 1/3 OF HIS JOB IN 15 DAYS
B = ?
LET 1ST PERSON BE x AND 2ND PERSON BE y
X AND Y TOGETHER CAN FINISH A WORK IN 25 DAYS.
ONE DAY WORK OF X AND Y = 1/25
ONE Day WORK OF X
WORK..........DAYS
1/3--------------- 15
1 ------------------ x
( cross multiplication )
x = 45
one day work of x & y = 1/25
x + y = 1/25
1/45+ y = 1/25
at last after taking 1/45 to the other side and after taking LCM
y = 4/225 = 56 1/4 days
kavyavj271:
Check Ur ans once again
yes I checked out . this is the correct ans .
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