Question

When Angelo cashed a check for $170, the bank teller gave him 12 bills, some $20 bills and the rest $10 bills. How many bills of each denomination did Angelo receive?

Answer 1

5 $20 bills and 7 $10 bills

Explanation:

You need to have 12 bills, and their values must add up to $170. Start with a guess, and adjust the guess until you find the answer.

The total number of $20 bills and $10 bills must be 10.

I made a table below. I started with a guess and kept adjusting it.

Number of Number of Total

$20 bills $10 bills Value

8 ($160) 4 ($40) $200 Value is too high.

6 ($120) 6 ($60) $180 Value is close

5 ($100) 7 ($70) $70 Correct value

Answer: 5 $20 bills and 7 $10 bills