Hi, can you explain how to get the equation for test 6, section 4, number 31, or fix the page error?

Thanks

Yes, and sorry about that page error. I am not sure why a very small number of old links stopped working!

The way to get this is to say that the original number of friends intending to go on the trip is . So the original amount each friend planned to pay was .

When two friends decide not to go, the price of the trip doesn’t change but now there are two fewer friends, so now each friend is going to pay .

The question tells us that in this second scenario, the friends will each pay $20 more, so we can write an equation and solve for .

To solve, multiply through by both denominators.

You can’t have a negative number of friends, so **there were originally 10 friends** (each paying $80) and then when 2 friends bailed, there were 8 friends paying $100 each.