## Search found 411 matches

Fri Feb 21, 2014 2:09 pm
Forum: Secondary Level
Topic: Even + Odd = Odd
Replies: 3
Views: 1978

### Re: Even + Odd = Odd

@Sakib
But the problem says that $n$ can only be an odd integer greater than $1$. Why are you bothered about even values of $n$?
Fri Feb 21, 2014 2:04 pm
Topic: BdMO National 2014: Junior 3
Replies: 1
Views: 1700

### Re: BdMO National 2014: Junior 3

Here are some hints- Hint $1$: Did you notice that, $(15*80)_{subrata_-minute} = (24*60)_{traditional_-minute}$ and, $(10*80)_{subrata_-minute} = (16*60)_{traditional_-minute}$ From this information, can you deduce, $1$ $subrata_-minute$ = how many $traditional_-minute$? Hint $2$: (answer) If yo...
Fri Feb 21, 2014 1:13 pm
Topic: BdMO National 2014: Junior 10
Replies: 4
Views: 2172

### Re: BdMO National 2014: Junior 10

Atiab, I've hardly used some English here. All the important things are written as equations. Try focusing on the maths instead of getting bothered with the English. I believe you'll be just fine. Still, if you have difficulty, let me know which step you didn't get. And, please post new problems in ...
Fri Feb 21, 2014 1:12 pm
Topic: BdMO National 2014: Junior 3
Replies: 1
Views: 1700

### BdMO National 2014: Junior 3

Subrata has invented a new type of clock,according to which, there are $15$ hours in each day and $80$ minutes in each hour. For example Subrata's clock shows $10:00$ when the actual time is $16:00$ in a traditional clock. If the time is $20:36$ in a traditional clock, then what will be the time in ...
Fri Feb 21, 2014 2:42 am
Topic: BdMO National 2014: Junior 10
Replies: 4
Views: 2172

### Re: BdMO National 2014: Junior 10

I'll give a step by step solution and I encourage everyone to think a lot before looking at the steps since it's an amazing problem. :) Step $1$: Most people actually do not understand what the problem is asking for (Even I did not get it at first). Let's define $d_i$ as the number of chocolates the...
Fri Feb 21, 2014 1:54 am
Forum: Secondary Level
Topic: chocolate problem
Replies: 1
Views: 1439

### Re: chocolate problem

Since it is a BdMO problem, I opened a different thread for it in the BdMO section so that everyone can find it easily.
Link to the thread : Junior $10$
Fri Feb 21, 2014 1:52 am
Topic: BdMO National 2014: Junior 10
Replies: 4
Views: 2172

### BdMO National 2014: Junior 10

Oindri has $100$ chocolates. She finished eating all her chocolates in $58$ days by eating at least one chocolate each day. Prove that, in some consecutive days she eat exactly $15$ chocolates.
Tue Feb 18, 2014 12:25 am
Forum: Primary Level
Topic: Can anyone help me finding the solution
Replies: 4
Views: 4384

### Re: Can anyone help me finding the solution

Now that I look at this, my solution looks faulty. Please ignore it.
The problem has no solution. (Why? One of the sons' age has to 13 or 26, But setting these as a son's age, we cannot get any valid solution.)
Tue Feb 11, 2014 11:28 pm
Forum: Secondary Level
Topic: giant prime
Replies: 3
Views: 1759

### Re: giant prime

সংখ্যাতে 1 ছাড়া অন্য কোন অঙ্ক থাকতে পারবে না? (গঠন দেখে সেরকমই মনে হচ্ছে তবে স্টেটমেন্ট-এ পরিষ্কার বলা থাকলে ভাল হয়)
Tue Feb 11, 2014 11:15 pm
Forum: Junior Level
Topic: Not hard, but...
Replies: 8
Views: 3551

### Re: Not hard, but...

Hint $1$: So, $\frac {a_1+a_2}2 = 1 \Rightarrow a_1+a_2 = 2$ and, $a_1,a_2 \geq 1$. Can you deduce the value of $a_0$ now? There was a typo in Hint $1$.Here's a corrected version. Hint $1$: So, $\frac {a_1+a_2}2 = 1 \Rightarrow a_1+a_2 = 2$ and, $a_1,a_2 \geq 1$. Can you deduce the value of $a_1$ a...