A and B can do a piece of work in 72 days, B and C can do it in 120 days, A and C can do it in 90 days in
what tine A alone can do it.
(a) 150 days
(b) 120 days
(c) 100 days
(d) 80 days
Answers
Answered by
1
Answer:
(b) 120 days
Step-by-step explanation:
(A + B)'s 1 day's work = 1 / 72
(B + C)'s 1 day's work = 1/120
(A + C)'s 1 day's work = 1 /90
2(A + B + C)'s 1 day's work =
1
72
+
1
120
+
1
90
(A + B + C)'s 1 day's work =
5+3+4
360X2
=
12
360X2
=
1
60
A's 1 day's work = (A + B + C)'s 1 day's work - (B + C)'s 1 day's work
=
1
60
−
1
120
=
2−1
120
=
1
120
A alone can finish the work in 120 days.
plz mark as brainlist
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