
Whiz S. answered 07/17/19
Experienced and patient Math tutor
Let
one woman takes x days to finish the work.
And one man takes y days to finish the work.
so
3/ x + 5/y = 4
3y +5x = 4xy ----------- (1)
then
2/x + 4/y = 3
2y+4x =3xy --------------(2)
[ 3y +5x=4xy] * 2 => 6y +10x =8xy
[2y +4x=3xy ] * -3 => -6y-12x =-9xy
____________________
-2x = -xy
2 =y
2y +4x =3xy
2(2) +4x =3x(2)
4+4x =6x
4 =2x
2 = x
so 1 man take 2 day s
and 1 woman take 2 days to complete this work