Headphones

Charlie is saving money to buy a pair of headphones for $225. He has $37 so far, and he can save $15 per week. In how many weeks will he have enough money to buy the headphones?

Correct result:

t =  13 w

Solution:

$$\begin{gathered} t_1={\displaystyle \frac{225-37}{15}}={\displaystyle \frac{188}{15}}\doteq 12.5333\text{ w } \\ t=\lceil t_1\rceil =\lceil 12.5333\rceil =13\text{ w} \end{gathered}$$

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