It your sister's birthday and you preparing a family meal. the joint of meat needs to be cooked for 30 minutes per 500 grams plus an extra 20 minutes. how long will it take to cook a joint of meat weighing 2.5 kilograms?

2 hours 50 minutes.

Step-by-step explanation:

It is given that the joint of meat needs to be cooked for 30 minutes per 500 grams plus an extra 20 minutes.

Fixed time = 20 minutes

Variable time = 30 minutes per 500 grams

We know that

1 kilogram = 1000 grams

2.5 kilogram = 2500 grams

According to the given information

500 grams = 30 minutes

Multiply both sides by 5.

2500 grams = 150 minutes

It means variable time for 2.5 kg is 150. Total time to cook a joint of meat weighing 2.5 kilograms is

Total time = 150+20 = 170 minutes

We know that 1 hour = 60 minutes.

Total time = 2 hours 50 minutes

Therefore, it will take 2 hours 50 minutes to cook a joint of meat weighing 2.5 kilograms.

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step-by-step explanation: