Mean and variance of six observations given; each is multiplied by 3: find the new variance

The same question, asked 2 times: 10 May 2023 S1*, 10 May 2024 S2. Every wording below, oldest first.

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Question 1
10 May 2023 S1
148 $Mean and variance of six observations are 6 and 12 respectively. If each observation is multiplied by 3, then new variance of the resulting observations is$
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Question 2
10 May 2024 S2
115 $Mean and variance of six observations are 8 and 16 respectively. If each observation is multiplied by 3, then new variance of the resulting observations is$
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