<PRE><B>Question 1054331</B>
x for how much of the 5% B1
y for how much of the 25% B1


Write equations to account for the desired masses of the B1 and B2 vitamins in the mixture.


58 mg of Vitamin B1
0.05x+0.25y=58


74 mg of Vitamin B2
0.1x+0.15y=74


The system before simplification is  {{{system(0.05x+0.25y=58,0.1x+0.15y=74)}}}.


Only more steps IF you need them.
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