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by Mani Raja
Replies
2
Views
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...

by Mani Raja
Replies
2
Views
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...

by Mani Raja
Replies
0
Views
581

### 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...

by Mani Raja
Replies
1
Views
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 ?

by Mani Raja
Replies
0
Views
551

### 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...

by Mani Raja
Replies
3
Views
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...

by Mani Raja
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...

by Mani Raja
Replies
2
Views
2,175

### Thanks a lot.

Thanks a lot.