Math CentralQuandaries & Queries


Question from Annie, a student:

I'm trying to follow a diet plan.  The diet says I should have a 125ml tub of natural low fat bio yogurt.  The only problem is, the yogurt pot lists its weight as 150g (with a large 'e' after it).  Can you tell me how much of the yogurt pot I'm suppost to  have please, or give me a conversion chart to change from g to ml for natural bio yogurt?  Many thanks, Annie.

Hi Annie.

My understanding is that the density of yoghurt is about 250 g per cup. Since a cup is about 237 ml, this means that 125 ml of yoghurt would be (250 g/ cup)(1 cup/236 ml)(125 ml). All the units cancel except grams, so you should limit yourself to (250 125) / 236 = 132 grams of yoghurt.

This is 132/150 = 88% of your yoghurt pot.

Hope this helps,
Stephen La Rocque.

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