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In mathematics, usually when you see the word "of" it means to multiply. So multiply the two fractions together (top x top and bottom x bottom) and you get 21/20.
The equation is undefined when the 0 is on the bottom of a fraction. This is because division by zero is not defined in mathematics and leads to undefined values. If the 0 is on the top of the fraction, the equation can still be evaluated and the value would be 0.
Its not about gender. I am in the top maths class just now, and there are the pretty much the same amount of boys as there are girls. It's about the individual person, && how hard they are willing to work.
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The language of the question is too ambiguous. In mathematics, we use precise language to avoid this problem. point a is 40 metres from the base of building B the angle of elevation to the top of building C is 51 degree and to the top of the flagpole D on top of building is 56 dedree