Find the value of expression:
2a - 2b - 10 + 4a + b, if a = 5 and b = 1.

-1

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-19

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Solution

The correct option is B
19

Simplify the expression: $2 a - 2 b - 10 + 4 a + b$
$= (2 a + 4 a) + (- 2 b + b) - 10 = 6 a - b - 10$

Substituting $a = 5$ and $b = 1$ in the above expression,

$6 a - b - 10$
$= (6 \times 5) - 1 - 10$
$= 30 - 11$
$= 19$

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