Answer:
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Step-by-step explanation:
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let the exterior angle be x
x=60°+80°(being one exterior angle is equal to two interior angle)
x°=140°
Ziad is 30 and marc is 10
The average can be calclculated as follows:
average = sum of number/number of numbers
average = (19+45) / 2 = 64/2 = 32