Question

When you roast coffee, it loses 12% of its weight. How much fresh coffee do you need in order to get 14 2/25 lb of roast coffee?

Answer 1

Answer:

X - X/12 = 14 2/5 = 72/5        1/12 of X is lost in roasting

(12 X - X) / 12 = 72/5

11 X / 12 = 72/5

11 X = 864 / 5

X = 864 / 55

15.71 lbs     handy to use calculator here

Or 864 / 55 = 15 39/55 lbs