exam Maths Puzzle Numerical Ability

i need help with metric system measurements

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exam Other Question

i need help not with the answer being gave but how to do it all together.
What is the average (arithmetic mean) of 8, 7, 7, 5, 3, 2 and 2? Given: h is parallel to d
Prove: m<11+m<10+m<18=180

the three angles make a triangle.