exam Maths Puzzle Numerical Ability

My teacher recently told us
ELEVEN plus THREE equals TWO.

And she wants us to figure out how.
So how does
11 + 3 = 2?

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exam Other Question

A 15FT LADDER LEANS AGAINST A BULIDING. THE BOTTOM OF THE LADDER IS 7FT FROM THE BUILDING.HOW HIGH IS THE TOP OF THE LADDER?ROUND TO 2 DECIMAL PLACES. Show that the product of 6x^2-13x-5, 15x^2-16x-7, and 10x^2-39x+35 is a perfect square by showing that it is the square of another polynomial.