i have 30 coins. some of them are dimes, and some of them are quarters. in total, i have $4.05. how many of each coin do i have?

23 dimes & 7 quarters

Step-by-step explanation:

You can create two equations:

Rearrange x + y = 30:

Substitute it into the x-value of the other equation & solve:

With the x-value, substitute it back to the original equation to find y-value:

Therefore, there are 23 dimes & 7 quarters.

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step-by-step explanation:

$9.89

step-by-step explanation:

9.90 = p x .06 x .25 (3/12 changed to a decimal)

9.90 = p x 0.015

9.90 - 0.015 = p

9.89 = p