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Decimals and fractions

father present age is 3 times of the sum of present age of his two sons .after 20 years father's age will be equal to the sum of his son's ages .find the age of father

A man sells 3 motors for Rs. 5000 , 3000 and 4350 respectively. He makes 20 % profit on 1st & 10% profit on 2nd but on the whole he loses 9 3/8 . What did the 3rd motor car cost him ?

What is the unit digit of 217^413*819^547*414^624*342^812

The ratio of ages of the father and mother was 11:10 when their son was born . the ratio of ages of the father and mother will be 19:18 when the son will be twice his present age . what is the ratio pf present ages of father and mother?

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hindi questions kyu nahi hai

In summers, the meter scale of a cloth merchant expands by 25%. By what percentage should he make up the cloth so that even after giving a 10% discount on the list price, the merchant still makes a profit of 8%?

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can anyone explain me ratio related concepts..?