Ex. 1. The sum of two numbers is 10...
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Ex. 1. The sum of two numbers is 10. Their product is 20. Find the sum of the reciprocals of the two numbers. (1) 1

11th - 12th Class
Maths
Solution
143
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Sol. (3) Let the two numbers are ( x ) and ( y ). ( x+y=10 ldots ldots ldots ldots . ) (i) ( x y=20 ldots ldots ldots ldots . ) (ii) Dividing equation (i) by (ii) [ frac{x+y}{x y}=frac{10}{20} Rightarrow frac{1}{y}+frac{1}{x}=frac{1}{2} ]
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