Question 83564
Let x=almonds, y=peanuts

Set up the following system of equations

{{{x+y=80}}} 
{{{8.75x+4.75y=520}}}


Multiply the 2nd equation by 100 to get whole numbers 


{{{100(8.75x+4.75y)=100(520)}}}


{{{875x+475y=52000}}}


So now we have the system

{{{x+y=80}}} 
{{{875x+475y=52000}}}


*[invoke solving_linear_system_by_elimination 1, 1, 80, 875, 475, 52000]


So you need 35 pounds of almonds and 45 pounds of peanuts (note: the order is reversed check the problem or the answer you have)