Question

Sima needs to cook a 7 kg turkey. She finds these cooking instructions cook the turkey for 20 minutes for each kg add an extra 125 minutes, The turkey needs to finish cooking at 11:30 am. Sima thinks that the turkey should start cooking at 7:00 am. (a) is Sima correct? Show why you think this. Show a check of your answer.

Answer 1

EXPLANATION:

We are given the following;

Sima needs to cook a 7kg turkey.

The instruction says to cook the turkey for 20 minutes for each kg. This means for a 7kg turkey, she should cook for;

$\begin{gathered} 1kg=20\min s \\ 7kg=(20\times7) \\ 7kg=140\min s \end{gathered}$

The cooking instruction further says to add an extra 125 minutes.

This means the turkey would cook for a total of;

$\begin{gathered} Time\text{ per }kg=140\min s \\ \text{Added time}=125\min s \\ \text{Total time}=265\min s \end{gathered}$

We can convert this to hours as follows;

$\begin{gathered} 60\min s=1hr \\ \frac{265\min s}{60}=(240\min s)4hrs\text{ rem 25 mins} \end{gathered}$

Therefore, if the turkey starts to cook by 7:00 AM, then 4 hours and 25 minutes later would be;

$7\colon00am+4\text{hrs 25 mins}=11\colon25am$

ANSWER:

If the turkey needs to finish cooking at 11:30 am, then Sima is right by starting at 7:00 am.

The turkey would be ready by 11:25 am which is right on time.