Question

Geoffrey and his babysitter spent 20 minutes preparing dinner, 2 hours and 30 minutes playing board games, and half an hour making dessert. How many minutes did they spend doing these activities?

Answer 1

200 minutes 
20 + 60 + 60 + 30 + 30 = 200

Answer 2

This is very simple!!
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Don't worry, no need to panic.
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Just add the number of minutes up!!
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Write the numbers that you can see are evident down.
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20... 2 hours and 30 minutes... no more.
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BUT WAIT!! 
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Half an hour looks suspicious.
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Isn't that 30 minutes?
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Add that to our list.
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Now, we have to convert 2 hours to minutes.
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Arggggh!!
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Don't worry, there's 60 minutes in an hour, so 60 x 2 is 120 minutes!!
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Add em' up!!
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20 + 120 + 30 + 30 is...
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200 minutes!!
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Or, 3 hours and 20 minutes.
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Hope I helped!!