Ex. If A can do a piece of work in 4 days, B can do the same work in 8 days and
Ccan do the same work in 12 days, then working together, how many days
will they take to complete the work?
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1
Answer:
Given that A,B does the work in 8,4 days; if total work be x;
⇒ work done in 1 day by A, B is
8
x
,
4
x
.
⇒ if they both work for one day then work done will be
⇒
8
x
+
4
x
=
8
3x
.
⇒ Then total work done x will take
3
8
=2
3
2
days .... (using proportions.)
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