Question

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A nutritionist mixes a supplement containing
45
%
protein with one containing
30
%
protein to create
80
grams of a mixture with
36
%
protein. Let
a
be grams of
45
%
supplement and
b
be grams of
30
%
supplement. The system is
a
+
b
=
80
and
Choose...

a
+

Choose...

b
=
28.8
.

Answer 1

0.45 a + 0.30 b = 28.8

(Explanation: 45% of a plus 30% of b equals 36% of 80, i.e. 28.8.)