inequality & sum and difference OF itf

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The sum of two numbers is 407. The sum and difference of their LCM and HCF are 925 and 851 respectively.The difference of two numbers is

What is the sum of the digits in the product of the sum and the difference of 4.5 and 2.5 ?

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If the sum and difference of two numbers are 20 and 8 respectively, then the difference of their squares is :