b) If 3876 people answered the survey in total, how many people said that they exercise at least twice a week? Key square square

## Step 1: <br />This is a logic problem, all that we need to do is remember the basic rules of decimal subtraction to complete the question's calculations. The ones position must be subtracted first, followed by the tens, hundreds, and so on. With a perfect understanding of subtraction chances of error are minimal or nil. <br /><br />## Step 2: <br />Subtract the given numbers in the right order: <br /><br />\[\begin{array} { padd }<br />3876 \\ <br />-338 \\ <br />\hline <br />{( )( )( )}<br />\end{array}\]<br /><br />## Step 3:<br />First, subtract the ones. Subtract \(6 - 8\). In this case \(6\) is smaller than \(8\), so you've to borrow one tens place like we usually do.<br /><br />### \[\begin{array} { r } -1 \\ +10 \end{array}\] <br /><br />This line above means that $10$ is added in our working column's $6$ and $1$ is subtracted in our next column that is tens column then our view on-digit subtraction becomes: <br /><br />### \(16 - 8 = 8\).<br /><br />So, the result is: <br /><br />\[\begin{array} { r }<br /> 3876 \\<br /> - 338 \\<br /> \hline<br /> 8( )( )<br /> \end{array}\]<br /> <br />## Step 4:<br />Next, Subtract the tens. Subtract \(7 - 3\) which equals 4 because now 7 has become converted to 6 @step3. Now the <br /><br />\[\begin{array} { r }<br /> 3876 \\<br /> - 338 \\<br /> \hline<br /> (3)(8)<br /> \end{array}\]<br /><br />## Step 5:<br />Finally, subtract the hundreds. \(8 - 3\)Difference is 5. Now the complete picture becomes:<br /><br />\[\begin{array} { r }<br /> 3876 \\<br />-338 \\<br />\hline<br /> 3538<br />\end{array}\]<br /><br />The final answer should be \(3538\).