1. 4x+5=25  x= 5

2. x/2+18=27 x=18

3. Susan's age is 3 times Jackie's age; Susan is older than Jackie by 18 years, how old is Susan?
    Susan is 27 years old.

4. The price of a plasma TV is 4 times the price of a digital camera and the price of the digital camera is  $2850. How much is the plasma TV?
    The plasma TV is $11400.

5. There is a triangle with three different sides; the first side is double the second side, the third side is 4cm shorter than the second side and the perimeter is 32cm. Find the length of the second side.     The length of the second side is 9 cm.