A can do a work in 10 days, B in 18 days, and A, B and C together in 4 days. In what time would C do it alone ? b. If (x - 5)² - (x + 2)² = - 2, find the value of x.
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Answer:
Step-by-step explanation:
A can do a piece of work in 10 days and B do the same work in 18 days.
Then A can do the work in one day =
10
1
And B can do the work in one day =
18
1
Then A & B's one day's work =
10
1
+
18
1
=
45
7
Given A ,B and C did work in 4 days
Then A ,B and C's one day work =
4
1
∴ C one day work=
4
1
−
45
7
=
180
17
When only C does work =
17
180
=10
17
10
days.
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