131° 1079 47°
х
o
XE
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x=75

Step-by-step explanation:

Sum of the interior angles of a trapezoid = 360°

That being said we can calculate the measure of the missing angle (x) by subtracting the given angles (131, 107 and 47) from 360

so x = 360 - 131 - 107 - 47

360 - 131 = 229

229 - 107 = 122

122 - 47 = 75

so x = 75

A= 228 tons  

B=52 tons

Step-by-step explanation:

Given data

Train A and Train​ B, weigh a total of 280 tons

A+B=2801

A-B=1762

From 1

A= 280-B

put this in 2

280-B-B= 176

280-2B= 176

280-176= 2B

104= 2B

B= 104/2

B=52 tons

Put B=52  in 1

A+52=280

A= 280-52

A= 228 tons