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## Answers

c = 500-d

240-b + 500-d = 215

740-b-d = 215

d-b + 500-d= 455

-b= 455-500

b = 45

740- 45 + 500 - d = 215

1195 - d = 215

-d = 215 - 1195

d = 980

A+b = 240, c+d = 500

d-b+c = 455

d+c = 455+b

a+c = 215

455+b = 500

b = 45

a = 195

c = 20

d = 480

d-b+c = 455

d+c = 455+b

a+c = 215

455+b = 500

b = 45

a = 195

c = 20

d = 480