The number X is placed somewhere between 9 and 10. That's because 9 squared is 81 and 10 squared is 100.
First off, let's convert the percentages to decimal format, so our 77% turns to 77/100 or 0.77, and our 55% turns to 55/100 or 0.55 and so on
now, the sum of both salines, must add up to the 77% mixture, let's say is "y"
so, 11 + 4 = y, and whatever the concentration level is, must also sum up to the mixture's concentration of 77%
anyway thus

solve for "x"
Value of the boat after 9 years= 12050*(1-0.12)^9
=$3814(correct to nearest integer)
Answer:
The awnser is 2 and 3!!!!!!