Please help answer growth word problem

I must not be doing this right, please answer 109:

Attachment 19341

Thanks!

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the country tripled the amount of food production ... feed 3 times 6 milllion people?

The populationdoubled every 15 years and in 30= 2(15) so the population doubled twice in 30 years.

Thanks for the replies.

I had read it as population doubled every 15 years and food tripled every 15 years, both for a 30 year total period.