book Maths Puzzle Numerical Ability LCM and HCF

The H.C.F of two numbers is 2 one of the number is 4 .find the other number.

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book Other Question

2234255355*4435555355=? AVG WEIGHT OF 6 PERSONS INCREASED BY 2.5KG WHEN A NEW MAN REPLACES ONE OF THEM WHOSE WEIGHT IS 50KG.THE WEIGHT OF NEW MAN IS