Question 911377
total sold 400
total sales 1050
product sold at 2 and 3
a+b=400,
2*a+3*b=1050
a=400-b
We have two equations with two variables.
We will substitute to make one equation with one variable
2*(400-b)+3*b=1050
800-2b+3*b=1050
1*b=250
b=250
a=400-b
a=150 at $2 and  b=250 at $3
check
150+250=400
2*a+3*b=1050
2*150+3*250=1050
300+750=1050
1050=1050
ok
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