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If p, q, r and s are different prime numbers less than 20, what is the greatest possible value of (p-q)/(2r+s)?

 May 29, 2018
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Prime numbers: 2, 3, 5, 19

[19 - 5] / [2*2 + 3]  =

    14 /  7

= 2

 May 29, 2018

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