I've been stuck at this simple algebra question for quite a while already. I would appreciate some help.

Given that:

  • a + b + c + d + e = 200
  • a + c + d = 85.841
  • 2d + 2e = a
  • find the value of c + 2d.


    • $\begingroup$ looking at it now $\endgroup$
      – apg
      Apr 12, 2014 at 10:39

    1 Answer 1


    There are infinitely many solution of this question. One of them is a=60, b=104.159, c=5.841, d=20, e=10. Just take any value(in range) of d and e you will get a then you will get c and then b. Three of the equation will be satisfied.

    • $\begingroup$ They didn't ask to solve the system (find the values for a, b, c, d, e). The question is to manipulate these equations to get the equation c + 2d = something. $\endgroup$
      – Dylan
      Apr 12, 2014 at 17:12
    • $\begingroup$ For different solution of the system value of c+2d will also change. So answer will remain infinite. $\endgroup$ Apr 13, 2014 at 17:42

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