Book Maths Puzzle Numerical Ability LCM and HCF

the hcf of 2 number is 12 and their diffrence is 12 the number are ?

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Book Other Question

a gols ornament weighing720g contains 90% of pure gold and rest silver.How much of silver(in grams)must be added so that the resultant mixture have 19% silver? log x - log y = log(x+y) then fing x