book Maths Puzzle Numerical Ability

how do u do 2 1/4 + (-4)?

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book Other Question

At the site of the old millstone, a triangle. Two sides: 15 and 10 yards; 30 degree angle opposite the 10-yard side: corner located at the center of the millstone. Third side: due A number t increased by the sum of seven and the square of another number s is ten

How can i write this question so that it reads as an equation?