Raw potatoes are composed of about 18%–20% starch and approximately 75% water. before frying, raw
potatoes are peeled and then washed. assume that 8% by weight of the raw potatoes is lost in the peeling.
potatoes are then dried to 7% total water content. what is the mass of dried potatoes produced from
each 100 kg of raw potatoes?

You start with 100 kg raw potatoes.

8% of mass is lost by peeling:

100 - ( 8 / 100) × 100 = 92 kg of peeled raw potatoes

By drying the water contents is reduces from 75% to 7%, that means a 68% loss by weight:

92 - ( 68 / 100) × 92 = 92 - 62.56 = 29.44 kg of dried potatoes

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while cooking a piece of 1/2 pound beef steak, a cast iron pan (2.4kg in weight) was heated 260 celsius.