Users Discussion Board

Deepika 6 years ago

The cost of telephone calls in an industrial town is 30 paise per call for the first 100 calls, 25 paise per call for the next 100 calls, and 20 paise per call for calls exceeding 200. how many calls can one make for rs.50

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Deepika 6 years ago

Pls anyone tell me the shortcut
I dnt require the process i want shortcut

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Devendra Marghade 6 years ago

Cost of first 100 calls=0.3*100=Rs 30
In remaining Rs 20, calls can be made 25 paise/call=20/0.25=80
Therefore, total calls=100+80=180

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Ram Kumar 6 years ago

Two workers undertake to do a job. The second worker started working two hour after the first. Five hours after the Second worker has begun working, there is still 9/20 of the work to be done. When the assignment is completed, it turns out that first worker has done 60% of the work while second worker has done rest of the work. How many hours would it take each one to do the whole job individually?

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Devendra Marghade 6 years ago

Ans: 20 hrs, 25 hrs

Working alone, let 1st worker can do a job in 'A' hrs and 2nd worker in 'B' hrs, then
1st working for 7 hrs and 2nd for 5 hrs, completes 11/20 of the work.
=> 7/A + 5/B = 11/20 ---(i)
Let the work gets completed in 'x' hrs and 1st worker does 60% work => x/A=60/100 or 1/A=3/5x ---(ii)
2nd worker does 40% work in (x-2) hrs => (x-2)/B=40/100 or 1/B=2/[5(x-2)] ---(iii)
Now substituting value of 1/A & 1/B in eqn (i), we get 7*(3/5x) + 5*2/[5(x-2)] = 11/20
21/x + 10/(x-2) = 11/4
[21(x-2) + 10x]*4 = (x² - 2x)*11
124x - 168 = 11x² - 22x
11x² - 146x + 168 = 0
11x² - 132x - 14x + 168 = 0
(11x-14) (x-12) = 0
x = 14/11, 12, considering whole number x=12
Now substituting value x=12 in eqn (ii) & (iii), we get A=20, B=25
Therefore, 1st worker takes 20 hrs and 2nd worker takes 25 hrs, to do the job individually.

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Sindhu R 6 years ago

In how many ways can the letters in mmmnnnppqq can be arranged with two n's together?

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shreosi mukherjee 6 years ago

In each of the series 1+3+5+7+... and 4+7+10+... is continued to 1000 terms. find how many terms are identical between the two series?

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Chayan Satapathy 6 years ago

Looking for jobs

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jack 6 years ago

Hirasugar Instiute Of Technology

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vikash shastri 6 years ago

#Business related problems by black magic#.#Business related problems by black magic#.

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sai teja perali 6 years ago

correct the sentence "The strange creature had shining feathers on his body ,his mouth appeared as though he was smiling constatnly,though he looked fierce "

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prateek jain 6 years ago

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prof premraj pushpakaran 6 years ago

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prof premraj pushpakaran 6 years ago

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sriganth 6 years ago

I am finish 12 standard next i waht do

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prof premraj pushpakaran 6 years ago

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Sevlvi 6 years ago

Permutations and combination puzzles

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