So Tax and tip together are 31- 25= $6.00

So the tax is 3 times as large as the tip. If we call the amount of the tip "t", then the amount of the tax is 3t.Tax and tip are unknown. If the ratio of the amount of the tax to the amount of the tip is 1 to 3

tip+ tax= t+ 3t= 6. Solve that equation for t., what is that amount of the tip?

ItWhy is is $4.50?isn't. According to you the question asked for the "amount of the tip" $4.50 is the amount of the amount of the tax.