# Finding the tip

• Feb 13th 2013, 09:17 AM
mjoshua
Finding the tip
A meal costed \$25.00 and the total cost of the restaurant bill is \$31. Tax and tip are unknown. If the ratio of the amount of the tax to the amount of the tip is 1 to 3, what is that amount of the tip?

Why is is \$4.50?
• Feb 13th 2013, 11:25 AM
HallsofIvy
Re: Finding the tip
Quote:

Originally Posted by mjoshua
A meal costed \$25.00 and the total cost of the restaurant bill is \$31.

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

Quote:

Tax and tip are unknown. If the ratio of the amount of the tax to the amount of the tip is 1 to 3
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.

Quote:

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

Quote:

Why is is \$4.50?
It 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.
• Feb 13th 2013, 09:55 PM
mjoshua
Re: Finding the tip
Yes, I gave the question verbatim so now what..? I guess I need the right formula for the tip then to obtain \$4.50?