Problema Solution
Joy is an instructional assistant in one of the college labs. She is on a very tight budget. She loves Jamaican Blue Mountain coffee, but it costs $18 a pound. She decides to blend this with regular coffee beans that costs $1.88 a pound. If she spends $14.25 on 3 pounds of coffee, how many pounds of each did she purchase?
Answer provided by our tutors
If she mixed x pound of mountain coffee with y pound of regular
then x+y = 3 (3 pound of mixture)
The cost is = x*18 + 1.88*y = $14.25 (one pound mountain costs 18 and one pound of regular costs 1.88).
putting x = 3-y in second equation
we get (3-y)*18 + 1.88y = 14.25
this given us y = regular = 2.67
and x = mountain = .53