Problema Solution
Mr. Lucido deposited 225 pesos in the bank. If his deposit consisted of 29 bills, consisting of 5 peso and 10 peso bills, how many 10 peso bills did he deposit?
Answer provided by our tutors
Let
x = the number of 5 peso bills, x>0
y = the number of 10 peso bills, y>0
His deposit consisted of 29 bills:
x + y = 29
Mr. Lucido deposited 225 pesos in the bank:
5x + 10y = 225
We have the following system of equations:
x + y = 29
5x + 10y = 225
........
........
x = 13 bills of 5 peso
y = 16 bills of 10 peso
Mr. Lucido deposited 16 bills of 10 peso.