Question

How many kg of pure salt must be added to 8 kg of a 30% solution to obtain a 35% soltution? Round to the nearest tenth.

Answer 1

8(.30-.35)/(1-.35); maybe, and drop the sign

Answer 2

Thanks OOOOOH

Answer 3

is it right? cause I cant tell yet

Answer 4

I don't know

Answer 5

well, its help if you knew how to know :) let me dbl chk it

Answer 6

a(-.35) + 8(-.35) = b(-.35)
a(1) + 8(.30) = b(.35)
-------------------------
a(1-.35) + 8(.30-.35) = 0

a = -8(.30-.35)/(1-.35)

Answer 7

it should be good, first one goes negative but i knew that lol

Answer 8

8/13 i believe is what the simplifies to