Thread: Please solve this maths problem

Another question

find the value of r when U=22/7(r+h)
where U=33/2 and h=2

The answer is 5/2 but i m getting 13/4.
So help is needed.

***moved to education section***

13/4 is right ans bcoz
u=22/7(r+h)
u=33/2 and h=3
so r=(7/22)u-h
=13/4

can anyone solve this...
if (a+b)(b+c)(c+a)=0 then prove that
(a+b)(b+c)(c+a) >= 8abc

Now solve this as well

if q is directly proportional to (P-1)^2 and P is always positive, find the value of P when q=80,if q=20 when P=3

the above ans is 12

given that
q dpt (p-1)^2
let k is +ve constant.
q=k(p-1)^2 ....................... eq(1)

given that when q=20 when p=3
so 20=k(3-1)^2
k= 5
from eq(2) put q=80 and k=5
now
80=5(p-1)^2
16=(p-1)^2
p-1=4
p=5

3.6Kg

ya 18/5 i got tat