exam Maths Puzzle Numerical Ability

the sum of two numbers is 12. three times the product of the numbers is 105. what re the twoo numbers?

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exam Other Question

prove that the sum of the angles of any quadrilateral is 360 degrees.

does it have to do with the expression: (n-2)180
where n is the number of sides?
I really do not get how to do problems like these. Here it is: Use two (2) unit multipliers to convert 6200 centimeters to kilometers.