She has ten $5 bills
Explanation:Let the number of $5 bills be x
Let the number of $20 bills be y
Altogether, she has 17 bills
x + y = 17........................(1)
The total amount of money in her her wallet
5x + 20y = 190...................(2)
Multiply equation (1) by 5
5x + 5y = 85...................(3)
Subtract equation (3) from equation (2)
15y = 105
y = 105/15
y = 7
Substitute y = 7 into the equation (1)
x + 7 = 17
x = 17 - 7
x = 10
She has ten $5 bills
