exam Maths Puzzle Numerical Ability

the area of Lake Superior is about 4 times the area of Lake Ontario.The area of Lake superior is 78,114 km squared.what is the area of lake ontario?

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How do I solve?
Thanks for your help.
sqrt 12a^2b=
Can you factor this so I can check my work and did it properly please? I really appreciate your help.:
x^2 - 9x = -8