book Maths Puzzle Numerical Ability

Solve the determinant
3 x
1 1 = 2

(the 3 x and 1 1 are inside determinant signs)

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book Other Question

A rectangle is 7 times as long as it is wide. Its area is 1400cm squared. Find the dimensions of the rectangle in simplest form. what is the property for the angle ocb=90 degees when you when you have to solve angle1+angle3=90degrees