Question

In 1 week Sato will spend 5 hours on e-mail, 18 hours on phone, 12 hours meeting. Write and evaluate an expression to predict how many hours he will spend communicating with his friends over the next 12 weeks.

Short answer

The total number of hours that Sato will spend communicating with his friends over the next 12 weeks is 420 hours.

Step-by-step solution

Step 1. Given information.

In 1 week:

5 hours = e-mail.

18 hours = phone.

12 hours meeting.

Step 2. Introduce the variable.

Consider the number of hours spent in communicating in 12 weeks be x.

Step 3. Write the equation.

Number of hours for communicating in 1 week will be:

$12+5+18$

So, the equation will be:

$x=12\left(12+5+18\right)$

Step 4. Solve the equation.

Take the equation $x=12\left(12+5+18\right)$and solve it.

$\begin{array}{c}x=12\left(35\right)\\ =420\end{array}$