exam Maths Puzzle Numerical Ability

What is the area of an ellipse with the major axis 20 m and the minor axis 10 m?

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exam Other Question

Please help.

Solve the following system by substitution

x + y = 12
y = 2x

Thanks
JMS find the diameter
circumference=283m
I know the formula:d=C/pi
but need step by step help in decimals divided by whole numbers