I know $135 is 5%, so $270 is 10% (because 5% + 5% = 10%). If you know what 10% of an amount is, you can just multiply that number by 10 to get to 100%. 270x10=2700
Another way to do this would be to say an unknown number, x, times 5% (0.05) equals $135. That equation would be 0.05x=135. Divide each side by 0.05 to get x = 2700
Since a triangle's angles add to be 180 degrees, you need to find the measure of the third angle. 180-55-65= 60 degrees ____________________________________ The equation would be 2x+30=60 2x=30 x=15