Question

Linda's paycheck was for $500.00. When she cashed her check at the bank, the teller gave her a total of 30 bills, both tens and twenties. How many twenties did the teller give Linda?

Answer 1

Let the teller gave her x tens and y twenties so
There were totally 30 bills, so
\[x+y=30\]
We also know that amount was $500,
so
\[10\times x+20\times y=500\]
Now we have two equations and two variables, can you solve this ?