It seems the real problem here is
1) determining the amount of time
2) determining the interest rate
Using a loan payment calculator, http://www.1728.org/mortmnts.htm
we determine that $235,000.00 financed for 30 years at a 7.7215% interest rate yields a monthly payment of $1,678.94
When financing a mortgage, (for example 30 years) in the early years of the mortgage, the vast majority of the payment goes to interest.
So, for your first payment, of $1,678.94, the amount going to interest is $1,512.13 and the amount going to principal is $166.81.
Basically, after spending $1,678.94 on your first mortgage payment, you actually own (the equity) $166.81.
The answer to this equality when you factor it is (2x-1)(x+2)(x-6)
log₉(<em>x</em> - 7) + log₉(<em>x</em> - 7) = 1
2 log₉(<em>x</em> - 7) = 1
log₉(<em>x</em> - 7) = 1/2
Take the base-9 antilogarithm of both sides; in other words, make both sides powers of 9:
can also be written as √9 = 3, and 
, so the equation reduces to
<em>x</em> - 7 = 3
Solve for <em>x</em> :
<em>x</em> = 10
The answer is 0.675. 2700:4000 is a ratio that can be expressed as 2700/4000 = 27/40 = 0.675
