SOLUTION: Elisa has $151 in her wallet, consisting of $20, $5, and $1 bills. The number of $20 bills is three less than the number of $5 bills. If she has 24 bills in her wallet, how many of

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Let = the number of $1 bills
Let = the number of $5 bills
Let = the number of $20 bills
given:
(1)
(2)
(3)
----------------------------
Subtract (2) from (3)

Substitute in (1)




and, from (1)


And using (2)



She has 11 $1 bills, 8 $5 bills, and 5 $20 bills
check answer:
(3)



OK