Question 1168488
L = 13.5%
T = 50.5%
H = 72%
M = 70 grams
p=unknown amount of the H % material
M-p the amount of the L % material


{{{Hp+L(M-p)=MT}}}
-
{{{Hp-Lp+ML=MT}}}
{{{(H-L)p=MT-ML}}}
{{{p=(MT-ML)/(H-L)}}}

{{{highlight(p=M((T-L)/(H-L)))}}}
Substitute the given values and evaluate p   and M-p.