ICSE − Q & A

The amount with Mr. X and Mr.Y is in the ratio 8:9. Y was given 180 more. How much should be given to X to maintain the ratio? Show the working!!

5. Mr. Christopher invests Rs. 26680 in buying Rs. 50 shares at a discount of 8%. He sells shares worth Rs. 15000 at a premium of 6% and the rest at a discount of 10%. Find his total gain or loss from the transaction. 
help please?

solve -  cos(50+theta) = sin(30+theta)

Tricky questions 
1)How many people must be there in a room to make the probability 100% that two people in the room have same birthday?
2)How many people must be there in a room to make the probability 50% that two people in the room have same birthday?

Pg.291,q.1 from selina.....pls help. ...

Anyone if knows which chapters are going to carry maximum marks

can anyone tell me wat to do in constructions
my 5 chpts r left wbu guys

Q) A certain sum of money amounts to Rs. 57600 in 2 years and to Rs. 65,536 in 4 years at CI. Find:
1) the rate
2) the sum of money

In 2007 boards maths paper: http://www.respaper.com/icse/410/1625-pdf.html
in question 7 (b), We would get two loci of A... so we will get 2 inradii.... correct me if i m wrong

I have a problem for you guys. If you are engrossed in Studies pls IGNORE. I repaet Do not Even LOOK AT IT. And for all the others here it goes:- Take any integer , If it is an even number then halve it, or if it is an odd number then triple it and add 1.(It means :- if n is even then n= n/2. If n is odd n=(3*n)+1.)
And I know your answer it would end like this - 4,2,1 .............. infinty.
If you need help here you - http://www.nitrxgen.net/collatz/.
Rmember the reward is worlds best mathematician.
Cheers.
Don't blame me if you wasted your time.(even I wasted mine.)