Problema Solution
Erwin has 40 pieces of coins consisting of 5 cents, 10 cents, and 25 cents. The number of 5 cents is equal to the number of 10 cents. If he has a total of 8.25, how many coins of each kind does he have?
Answer provided by our tutors
Let
x = the number of 5 cents
y = the number of 10 cents
z = the number of 25 cents
x + y + z = 40
x = y
5x + 10y + 25z = 825
........
click here to see the system of equations solved for x, y and z
........
x = 5 coins of 5 cents
y = 5 coins of 10 cents
z = 30 coins of 25 cents
Erwin has 5 coins of 5 cents, 5 coins of 10 cents and 30 coins of 25 cents.