Raul writes a formula for the number of hours in any number of days. He writes: number of hours$=24\times \mathrm{number} \mathrm{of} \mathrm{days}$

Explain why this formula is correct.

Write the formula using letters. Use $h$ for hours and $d$ for days.

Raul writes a formula for the number of hours in any number of days. He writes: number of hours$\left(h\right)$$=24\times \mathrm{number} \mathrm{of} \mathrm{days}$$\left(d\right)$

Use the formula to find number of hours in five days.

Write a formula to find number of minutes in any number of hours, in: words.

Write a formula to find number of minutes in any number of hours, in: letters.

Kristina goes out for a meal at a restaurant with four friends. They share the total cost of the meal equally between the five of them.

Write a formula to work out the amount they each pay, in: words

Kristina goes out for a meal at a restaurant with four friends. They share the total cost of the meal equally between the five of them.

Write a formula to work out the amount they each pay, in: letters

Kristina goes out for a meal at a restaurant with four friends. They share the total cost of the meal equally between the five of them.

Let, the formula of the amount they each pay, in: letters is $\$\frac{x}{5}$, when $\$x$ is the total cost of meal. Now, find the amount they each pay (in $\$$)when the total cost of the meal is $\$85$

Jan calculates how much money he has left each week, using the formula:

$M=P-E$

$M$ is the money he has left over, $P$ is the money he has paid for working and $E$ are his expenses.

Find the value of $M$(in $\$$) when $P=\$225$ and $E=\$72$

Jan calculates how much money he has left each week, using the formula:

$M=P-E$

$M$ is the money he has left over, $P$ is the money he has paid for working and $E$ are his expenses.

Find the value of $M$(in $\$$) when $P=\$178$ and $E=\$36$