Question

robert is cooking a pork loin roast and a rice dish for dinner. he wants both dishes to be ready at 6:30 p.m. the cookbook says to roast the meat for 20 minutes per pound. the rice dish will take 35 minutes to cook.

q. if robert puts the roast in the oven at 5:20 p.m., how many minutes will robert have before he must put the rice on the stove?
enter your answer as a whole number.

Explanation:

Determine the rice start time

To have the rice ready at 6:30 p.m., we subtract its cooking duration.
Using the Time Math knowledge point:

$$ 6:30\text{ p.m.} - 35\text{ minutes} = 5:55\text{ p.m.} $$

Calculate the waiting time

Robert starts the roast at 5:20 p.m. and must start the rice at 5:55 p.m.
Using the Time Math knowledge point:

$$ 5:55\text{ p.m.} - 5:20\text{ p.m.} = 35\text{ minutes} $$

Answer:

If Robert puts the roast in the oven at 5:20 p.m., how many minutes will Robert have before he must put the rice on the stove? Enter your answer as a whole number. <blank>35</blank>