hii ppl

this is anya sah

am doin computer engg (3rd yr) from mumbai.

will be taking CAT in 2005.

just wanted to introduce myself.

ciao

The third equation is

r2*t + r2*(t+5) = 425 ( from the first statement that states the tank is filled by the 2 pipes open for t and (t+5) hours respectively)

Solving the three equations we get t = 15 or t = -4/3;

Hence t= 15 hours;

This is the answer to the pipe problem.

The answer is that the first pipe is opened for 15 hrs. It's rate is 15 l/h. The other thus is opened for 20 hrs whose rate is 10l/h. Thus they fill together in 17 hrs.

the medians of a triangle divide a triangle into four equal sides triangle.

also, the ratio of the area of a triangle formed by using the medians as sides to that of the original triangle is 3:4

This theorem exists.

If such a theorem exists, then it's wrong.

The answer is 3:2, and infact takes some skill to prove that. No formula remembring.

ur question was pretty good. but if u c u could hav used ratios instead of variables it cud hav been easy. the ratios of the rate of pipes are aprx to 1:2 n so the time taken will be 2:1. so now it gets simple n the ans i get is 15hrs. hope its write.

waitin for reply :idea:

the medians of a triangle divide a triangle into four equal sides triangle.

also, the ratio of the area of a triangle formed by using the medians as sides to that of the original triangle is 3:4

This theorem exists.

Right answer. Except your reasoning is highly flawed 😃

is it 3:2???..aint sure abt my approach.....

by summation of All median's by median formula for PQR we wld have...M1^2 + M2^2 + M3^2 = 3/2(PQ^2+ QR ^2 + QR^2)..

i then substituted PQ,QR and PR by length's which are in accordance with M1,M2 and M3...which are 6^1/2 ,..so on..all of em are in ratio 3/2 ^1/2 ..with sides of ABC..ao area in ratio 3:2..

i doubt this approach...waitin for correct answer if mine's wrong and a better approach...wat say CBM..

A triangle ABC has sides 3,4,5 respectively.

The triangle PQR has length of the medians as 3,4,5 respectively.

Ratio area(ABC)/area(PQR) ?

plz solve....

susheel makes 100 calls to 10 people .he makes at least 4 calls to each person.

in how many ways can he distribute these hundred calls among the 10 people

irrespective of the order of the calls

1) 100 C 10

2)99 C 6

3) 60 C 6

4)69 C 9

answer i got is 10^60

a1 + a2 +....+a10 = 100

but each of a1, a2 starts with 4subtract 3from each.

a1 + a2+...+ a10 = 70

solutiuon in naturals is 69 C 9.