The value $p + q + 3 r$
$w h e n p = 1, q = 5, r = 2$ is ___ .

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Solution

$p + q + 3 r, w h e n p = 1, q = 5, r = 2$

$p + q + 3 r = 1 + 5 + 3 (2) = 12$

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