exam Maths Puzzle Numerical Ability

There are 20 kilograms of a solution that is 10% salt. How many kilograms of salt must be added to make a solution that is 25% salt?

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PLEASE HELP. TOPIC: FINDING THE CONSTANT OF VARIATION

FIND THE CONSTANT OF VARIATION k.

M VARIES DIRECTLY WITH N;
M=144 WHEN N=8

THANKS
JMS
i have to simplify this

1/8(3x+1)^(3/2) + 1/4(3x+1)^(1/2)

^ means to the power of if you didnt know