book Maths Puzzle Numerical Ability

how many kilograms of pure salt must be added to 20 kilograms of a 10 percent salt solution to obtain a 25 percent salt solution?

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Pleased help me sir....
How many grams of an alloy containing 35% nickel must be melted with an alloy containing 65% nickel in order to obtain 20 grams of an alloy containing 41% nickel? Graph the linear system and estimate the solution.Then check the system algebraically.

2x+y=9
-x+6y=-1