Alana set her watch 5 seconds behind, and it falls behind another 2 seconds everyday. How far behind is Alana's if she last set 12 days ago?

Question

Alana set her watch 5 seconds behind, and it falls behind another 2 seconds everyday. How far behind is Alana's if she last set 12 days ago? PLEASEE HELP!!!!

Answer 1

Hi Kaemon!

So let's start by keeping track of the delay, or how far behind the watch is. At the beginning, the watch is accidentally set 5 seconds behind. This means delay = 5 seconds.

We then see that it falls behind 2 more seconds every day, and she last set the watch 12 days ago. If it's been 12 days and the watch falls behind 2 seconds each day, this means it's fallen behind 12*2 = 24 seconds by itself.

Adding this on, delay = 5 + 24 = 29 seconds.