book Maths Puzzle Numerical Ability

Multiply

10
7 x



.

4
7x

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book Other Question

N is 16 less than 2K
K is 2 more than N
What is the value of N
have three problems that i am really stuck on and I don't even know where to begin

I HAVE 3 PROBLEMS THAT I AM CLUELESS ON HOW TO ANSWER. HERE THEY ARE

1) IF f(X)=3/8X SQU