SOLUTION: At a luncheon for doctors, all but 40 were neurosurgeons, all but 50 were pediatricians, and all but 60 were cardiologists. How many of each group attended the luncheon?

Question 822368: At a luncheon for doctors, all but 40 were neurosurgeons, all but 50 were pediatricians, and all but 60 were cardiologists. How many of each group attended the luncheon?
Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
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N = total number of doctors:
x = N - 40
y = N - 50
z = N - 60
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y + z = 40
x + z = 50
x + y = 60
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copy and paste the above standard form linear equations in to this solver:
https://sooeet.com/math/system-of-linear-equations-solver.php
---
answer:
x= neurosurgeons = 35
y= pediatricians = 25
z= cardiologists = 15
---
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---
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---
Solve systems of linear equations up to 6-equations 6-variables:
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