Find the value of $2 a + 4 b + 5 c$ when $a = 5, b = 10$ and $c = 20.$

150

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120

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Solution

The correct option is A 150
Consider the expression $2 a + 4 b + 5 c .$
Substituting $a = 5, b = 10$ and $c = 20,$ we have

$2 a + 4 b + 5 c = 2 (5) + 4 (10) + 5 (20)$

$= 10 + 40 + 100$

$= 150$

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