A Shopkeeper 4

A Shopkeeper gave a bill to a customer. The bill was in two digits but was mistakenly interchanged thereby undercharging the customer by $45.00.
If the sum of the digits is 9, find the actual value of the bill.

Correct answer:

a =  72 USD

Step-by-step explanation:

y 10+x=(x 10+y)45 x+y=9  9x9y=45 x+y=9  Row291 Row1Row2 9x9y=45 2y=4  y=24=2 x=945+9y=945+9 2=7  x=7 y=2  a=10 x+y=10 7+2=72 USD



Did you find an error or inaccuracy? Feel free to write us. Thank you!







Tips for related online calculators
Do you have a linear equation or system of equations and looking for its solution? Or do you have a quadratic equation?

You need to know the following knowledge to solve this word math problem:

Related math problems and questions: