Problema Solution
How many liters of 30% silver must be added to 90 liters of 50% silver to make an alloy that is 40% silver?
To make the desired alloy, use ____ liters of the 30% silver.
Answer provided by our tutors
Let
x = liters of the 30% silver
90 liters of the 50% silver
We mix them together to get x + 90 liters of allot that is 40% silver:
0.3*x + 0.5*90 = 0.4*(x + 90)
........
click here to see the equation solved for x
........
x = 90 liters
To make the desired alloy, use 90 liters of the 30% silver.