Donovan spent some money on friday. He spent thrice as much money on saturday than on friday. He spent $20 on sunday. If he spent a total of $125 in the 3 days, how much did he spend on saturday?

x = money spent on Friday, thus 3x = money spent on Saturday.

x + 3x + 20 = 125

Solve for x and then 3x.

To solve this problem, we can start by assigning variables to the unknown quantities:

Let's say Donovan spent x dollars on Friday.
According to the problem, he spent thrice as much money on Saturday as he did on Friday, so he spent 3x dollars on Saturday.
Finally, the problem states that Donovan spent $20 on Sunday.

Now, we can set up an equation to represent the total amount Donovan spent over the three days:

x + 3x + $20 = $125

Combining like terms, we have:

4x + $20 = $125

Next, we can solve for x by subtracting $20 from both sides of the equation:

4x = $125 - $20
4x = $105

Finally, we can solve for x by dividing both sides of the equation by 4:

x = $105 / 4
x = $26.25

So Donovan spent $26.25 on Friday.

To find out how much Donovan spent on Saturday, we can substitute the value of x in the equation we set up:

3x = 3 * $26.25
3x = $78.75

Therefore, Donovan spent $78.75 on Saturday.