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This problem trains for: Math Kangaroo 5-6, Math Kangaroo 7-8, SAT-I, AMC-8, GMAT.
If white flour is 59% of a white bread mix and proteins form 12% of the flour, approximately what percentage of white bread is protein?
Let us denote the amount of bread with B, the amount of flour with F and the amount of protein with P. Then, we have:
Substitute the first relation for the value of F in the second one:
The unknown percentage x is:
Solve for x: