bewellplus.gsu.edu
jemshad jemshad
  • 28-08-2014
  • Mathematics
Answered

a+b=240

c+d=500

d-b+c=455

a+c=215

d?

Verified Answer :

crisforp
crisforp crisforp
  • 28-08-2014

a+b=240 => - a - b = - 240; but, a+c=215 => -b + c = -240 + 215 = - 35; but, d-b+c=455 => d = 455 + 35 => d = 490.

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