Discussion Room : Quant

  • @zabeer
    Thank u. Got it :)

  • @zabeer

    sir i got RS =6sqrt 3
    dont know how to proceed further.......................................

  • @vinaycat2017
    Angle R =90
    PR =12 (by similarity)
    Apply pythagores in tri PRS

    Hope it helps..

  • 3 individuals john wright, greg chappell and gary kristen are in the race for the appointment of new
    coach of team india. The probabilities of their appointment are 0.5, 0.3 and 0.2 respectively. If john
    wright is appointed then probability of ganguly appointed as a captain will be 0.7 and corresponding
    probability if greg chappell or gary kristen is appointed are 0.6 and 0.5 respectively. find the overall
    probability that ganguly will appointed as a captain

  • Being MBAtious!

    In general,
    If you have OR, ADD the probabilities.
    If you have AND, multiply the probabilities.

    Here, Ganguly can be the captain in the following manner
    (John AND Ganguly) OR (Greg AND Ganguly) OR (Gary AND Ganguly)
    (0.5 * 0.7) + (0.3 * 0.6) + (0.2 * 0.5) = 0.63 should be our answer.
    What's the OA ?

  • @zabeer zabeer sir ek profit loss ka doubt hai i cant calculate the initial and final amount plz help..

    A reduction of 20% in the price of sugar enables a housewife to purchase 6 kg more for Rs. 240. What is the original price per kg of sugar?

  • Being MBAtious!

    Let original price be x per kg
    So initially, we could buy 240/x kg for 240 rupees
    Now the new price is 0.8 x (20% reduction in x)
    So now we can buy 240/0.8x kg for 240 rupees
    The difference, 240/0.8x - 240/x = 6 kg (given)
    240/x (1.25 - 1) = 6
    x = 240 * 0.25/6 = 40 * 0.25 = 10 rs / kg would be the original price.

  • Find number of whole number solutions of a + b + c + d = 20 where a, b, c and d ≤ 8

    = 23c3 - 4 * 14c3 + 4c2 * 5c3
    = 1771 - 1456 + 60
    = 375

    why 60 is as added here, if we go by the common way for odthis instead of coefficient method:

    (9+a')+(b+c+d) =20

    so total ways= 23C3- 4*14c3.=315
    which 60 cases need to be added here?
    Could anyone expalin the part?

  • Question : A does half as much work as B in 3/4th of the time. Together they take 18 days to complete the work. How much time shall B take to do it?

    Did it as follows.
    Assumed B takes 12 days to to do 12 work. (Rate 1w/day)
    So, A does 6 work(half as much as B) in 9 days (3/4th of the time taken by B to do the same) so the rate is 6/9 = 2/3 work per day)
    Given they take 18 days to complete the work. One day they do (1+2/3) = 5/3 work, in 18 days they do 30 work.
    Hence B shall take 30 days to do 30 work since the rate of B is 1w/ day.

    But the answer given is 45 days.
    Is there any logic fail in the method I used?

  • In how many ways 8 friends be arranged in a row if three of the friends do not want to sit at the

    pls explain?

  • Being MBAtious!

    @aadi-rs 30 days is correct I guess.

    1/a + 1/b = 1/18
    we know, a = 3b/2 (half the work in 3/4th time means full work in 1.5 times the time taken by b)
    2/3b + 1/b = 1/18
    5/3b = 1/18
    b = 18 * 5/3 = 30


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