Question 1201992
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Presumably this problem is to be solved using formal algebra.  If so, then use the standard solution method shown by the other tutors.<br>
If formal algebra is not required, here is a quick and easy informal way to solve any 2-part mixture problem like this.<br>
The mixture's percentage of 35% is 15/25 = 3/5 of the way from 20% to 45% (look at the numbers 20, 35, and 45 on a number line to see this, if it helps).<br>
That means 3/5 of the mixture is the higher percentage ingredient.<br>
3/5 of 2000 pounds is 1200 pounds.<br>
So...<br>
ANSWER: 1200 pounds of the 45% protein, 800 pounds of the 20% protein.<br>
CHECK:
.45(1200) + .20(800) = 540 + 160 = 700
.35(2000) = 700<br>