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  1. Replies
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    2,119

    population-word problem

    An insect colony doubles in population every 10 years. Its population is reduced by 20% every 7 years. After 50 years, the population of this colony is how many times its initial population, rounded...
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    1,606

    permutation,combination

    Jane must select three different items for each dinner she will serve. The items are to be chosen from among five different vegetarian and four different meat selections. If at least one of the...
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    counting principle

    Q- Joe will pick 3 friends to join him on a road trip.His friend group consist of 4 musicians and 3 poets.In how many different ways can joe select his 3 traveling companions so that he has atleast...
  4. Thread: proportional

    by Mani Raja
    Replies
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    801

    proportional

    Hi all,
    If it takes 3 days for 10 workers to finish building a house,how many days will it take 15 workers to finish 4 houses ?
    How to solve these kind of problems ?
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    counting principles

    Q- Joe will pick 3 friends to join him on a road trip.His friend group consist of 4 musicians and 3 poets.In how many different ways can joe select his 3 traveling companions so that he has atleast...
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    3
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    1,742

    counting principle

    Q- Joe will pick 3 friends to join him on a road trip.His friend group consist of 4 musicians and 3 poets.In how many different ways can joe select his 3 traveling companions so that he has atleast...
  7. Replies
    2
    Views
    1,445

    Number property

    b,c and d are consecutive even integers such that 2<b<c<d.What is the largest positive integer that must be a divisor of bcd ?

    i can understand everything except how they got the fourth 2 in the...
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    2,175

    Thanks a lot.

    Thanks a lot.
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    2,175

    percentage problem

    A mixture of 12 ounces of vinegar and oil is 40 percent vinegar,where all of the measurements are by weight.How many ounces of oil must be added to the mixture to produce a new mixture that is only...
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