Write the expression for the following cases:
Three times the difference of $30$ and $a$

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Solution

To express the statement:
Three times the difference of $30$ and $a$ as algebraic form
So, here difference of $30$ and $a$ is $30 - a$
And, three times of it means that $3 (30 - a)$
Hence, three times the difference of $30$ and $a$ expressed as $3 (30 - a)$ .

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