tony had 13 bills in his wallet. they were all fives or tens. the total amount of money in his wallet was $90. How many five dollar bills did he have in his wallet?
Mathematics · High School · Thu Feb 04 2021
Answered on
Tony had 13 bills in his wallet. They were all $5 or $10. The total amount of money in his wallet was $90. How many $5 in his wallet"
Let number of $5 bills be= x
Then number of $10 bills must be = 13-x
Value of the $5 bills is 5x dollars
Value of the $10 bills is 10(13-x)=(130-10x) dollars
EQUATION:
value + value = $90
5x+130-10x=90
-5x=-40
x=8 (number of $5 bills)
13-x=5 (number of $10 bills)