Hello, eunabug!

Bridgett has 64 coins in nickels and dimes.

What is the minimum number of dimes she should have to have at least $4.55?

Set up the inequality and solve.

Let: .

Then: . .[1]

The value of the coins is: . cents

. . which is to be at least 455 cents.

We have: . .[2]

Substitute [1] into [2]: .

. .

Therefore, Bridgett should have at least 27 dimes.