finding the missing number by pattern

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In this riddle you need to find a pattern between every couple of numbers.

Given numbers $5$ and $10$ there is a pattern like in the numbers $10$ and $3$.

Given numbers $10$ and $15$ there is a pattern like in the numbers $6$ and $1$.

Given numbers $10$ and $6$ there is a pattern like in the numbers $x$ and $8$.

find $x$.

• the pattern is the same in all examples.

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1 Answer

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$x=20$ Since in first riddle the numbers are 10 and 3 they are formed by $5×2$ & $5-2$ . In the second numbers are 6 and 1 they are formed by $3×2$ &$3-2$ . From here $x=20$ gives the numbers 20 and 8 and they are formed by $10×2$ & $10-2$.

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