Express your answer in units of kWh/d.

Question

Chickens require 0.075 kWh per day of energy (as feed) for each kilogram of animal, and 2/3 of an adult chicken is edible meat. The lifespan of a chicken is 50 days.

What is the daily energy requirement needed to sustain the livestock for consumption of 0.25 kg of chicken meat per day? Express your answer in units of kWh/d.

Answer 1

0.25kg edible meat 

________________

          1 day            

 

 

1 kg of adult chicken

_________________

2/3 kg of edible meat

 

 

0.075kWh of energy

________________

1 kg of adult chicken

 

 

(0.25)*(1)*(0.075)kWh

___________________ =0.028125 kWh/day

(1)*(2/3)*(1) day

 

-The first fraction says "we desire 0.25kg of edible chicken meat per day".

-The second fraction says "for each kg of adult chicken, 2/3 kg is edible" (that is, 2/3 of an adult chicken is edible.

-The third fraction says "we need 0.075kWh of energy per day to sustain 1kg of adult chicken".

 

If we multiply the three fractions together, the units of "kg of edible meat" and "kg of adult chicken" cancel, to leave us with units of kWh/day (energy in feed, per day).