a + t = 40
t + m + b = 90
b + d = 100
d + a = 60
a = ?
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t + m + b = 90
a + t = 40
m+b-a=50
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b + d = 100
d + a = 60
b-a=40
_______________________________
m+b-a=50
b-a=40
m+40=50 m=10
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t + b = 80
a + t = 40
b + d = 100
d + a = 60
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b-a=40
b-a=40 a=0 b=40
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d=100-b d=60
t=40-a t=40
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