Chapter 6.3, Problem 4GP

To determine

To determine the number of friends invited by Tamera and Adelina

Answer to Problem 4GP

Tamera invited 21 friends while Adelina invited 26 friends.

Explanation of Solution

Given:

Tamera invited 5 fewer friends than Adelina.

And, They both invited a total of 47 friends together.

Calculation:

Let,

The total number of friends invited by Tamera be x

The total number of friends invited by Adelina be y.

Tamera invited 5 fewer friends than Adelina, which means,

  $x-y=-5$

And, They both invited a total of 47 friends together,which means,

  $x+y=47$

Let the equation,

  $x-y=-\mathrm{5.......}(i)$

  $x+y=\mathrm{47.......}(ii)$

Now, add equation ( i ) and equation ( ii ),

  $\begin{array}{l}\Rightarrow (x-y)+(x+y)=-5+47\\ \Rightarrow x-y+x+y=42\\ \Rightarrow 2x=42\\ \Rightarrow x=21\end{array}$

Now, substitute the value of x in equation ( i ),

  $\begin{array}{l}\Rightarrow 21+y=47\\ \Rightarrow y=26\end{array}$

Conclusion:

Therefore, the numbers of friends invited by Tamera and Adelina were 21 and 26 respectively.