Question 888616
You need to assign variables to specific numbers or quantities.


L = unknown, for the lower priced bean B
H = 0.80 dollars/kg of bean A
T = 0.60 dollars/kg of the mixture
M = 10 kg, amount of mixture
x = unknown, how much of bean B
y = unknown, how much of bean A


You omitted some information from the description or the question.  You have three unknown variables:  L, x, and y.  Two equations are possible for the set of assigned variables:


{{{highlight((Lx+Hy)/M=T)}}} and {{{highlight(x+y=M)}}}


You may be able to solve enough to get a range of values for x, y, and L; but the system as currently, has infinite solutions.  You can find a clear treatment about this kind of problem in this lesson:  <a href="http://www.algebra.com/my/mixture-price-two-part-both-parts-unknown.lesson?content_action=show_dev">Mixture: Two-Part, price or cost, both material amounts unknown </a>  (unless the link does not work for some reason).