Question no 2. Give ans win recharge

Hi friends,
as i have announced that we all are together have start a test and in which i will ask you a question and first correct answer get free balance from www.latestlootoffers.blogspot.in
and this test is sponcerd by
www.bechdee.in( sell your books online)

question-
if
(x+y):(y+z):(z+x)=5:7:8
& x+y+z=10
what is value of z?
1)===2
2)===3
3)===5
4)===7
please explain also (till 6 PM)
and the winner is For last test is-

Preeti Khurana(20,30)
please mail us your no so we can recharge ( Dont worry your No  will be safe)

terms-
1. Ans is given in comment box or you can mail-rak.manth@gmail.com