Search found 6 matches

by Shafin
Mon Jan 14, 2013 8:02 pm
Forum: Junior: Solved
Topic: Dhaka Junior 2011/5
Replies: 5
Views: 1930

Re: Dhaka Junior 2011/5

Four digit palindrome number should be like ABBA.If u reverse it u will get also ABBA.At first we will count how many numbers are palindrome.It is enough to count AB.SO we will get the result 9o.Then the ans 10000-90=9910 4 digit number starts from 1000 so there are 9000 4 digit numbers therefore t...
by Shafin
Mon Jan 14, 2013 7:51 pm
Forum: National Math Olympiad (BdMO)
Topic: BdMO National 2012: Junior 6
Replies: 4
Views: 1537

Re: BdMO National 2012: Junior 6

The distance from B to the point on the circle that is furthest from B is 9.8 cm .
by Shafin
Sun Jan 13, 2013 4:49 pm
Forum: National Math Olympiad (BdMO)
Topic: BdMO National Primary 2011/3
Replies: 2
Views: 1002

Re: BdMO National Primary 2011/3

51 balls is the answer
by Shafin
Thu Jan 10, 2013 7:27 pm
Forum: Physics
Topic: Change of temperature by adding water
Replies: 4
Views: 1457

Change of temperature by adding water

Some hot water was added to three times its mass of water at 100 C and the resulting temperature was 200 C. What was the temperature of the hot water?


From ctg ques 2013
Pls explain the answer
by Shafin
Thu Jan 10, 2013 5:10 pm
Forum: Junior: Solved
Topic: Dhaka Junior 2011/9
Replies: 7
Views: 2783

Re: Dhaka Junior 2011/9

nafistiham wrote:$BD=2$
$DE=DO+OE=DO+DO=AC=3$
$BE^2=BD^2+DE^2=13$
Can u draw it on a paper and then upload the image with positions of all e points? I cant understand the position of e
by Shafin
Thu Jan 10, 2013 4:42 pm
Forum: National Math Olympiad (BdMO)
Topic: BdMO National 2012: Junior 5
Replies: 5
Views: 1757

Re: BdMO National 2012: Junior 5

I could solve the 1st part only....can anyone explain the another one..... Here is my ans ( I'm not sure wheter i'm correct ) :?: 2nd Part $\angle ACB = 30^{\circ}$ $\angle ABC = 90^{\circ}$ ( Since it is a right angled triangle ) $\angle BAC + 30^{\circ} + 90^{\circ} = 180^{\circ}$ $\angle BAC= 60...