Viewing page 20 of 91

This transcription has been completed. Contact us with corrections.

8 - 9               Army Air Forces
 (c) Example: 65 is 13% of what number?
     Solution: 65 = .13x
               x = 65/.13 = 500                 Answer.
 Note. --- To solve these equations it is always necessary to divide by the multiplier of x.
 f. Exercises. ---(1) If 23 percent of a class of 1,900 cadets attend two engine training schools, find the number of cadets in this class who attended these schools. 
 (2) If 36 percent of a class of 1,800 cadets take their advanced training in Alabama, how many cadets does this represent?              648  Answer.
 (3) A lieutenant calls a detail of 24 men. This represents 6 percent of the men in his squadron. How many men are there in the squadron?
 (4) At 1,000 rpm, a propeller uses 80 percent of the horsepower developed. If the engine develops 1,500 horsepower at 1,000 rpm, how many horsepower are used by the propeller?                      1,200hp Answer.
 (5) The top speed of an aircraft at 8,000 feet is 314 mph. At 12,000 feet the top speed has increased 8 percent. What is the top speed of the aircraft at 12,000 feet?
 (6) For a certain air density, the true altitude is 16 percent greater than the calibrated altitude. If the true altitude is 17,400 feet, find the calibrated altitude.                                15,000 ft Answer.
 (7) At 15,000 feet altitude and at -10° C., the calibrated air speed is 240 mph. The true air speed is 15 percent more than the calibrated air speed. Find the true air speed. 
 (8) A sample of nickel steel contained 25.61 percent of nickel and 0.17 percent of carbon. How much nickel and how much carbon would be found in a ton of this nickel steel?                          512.2 lb nickel Answer.                
                                                     3.4 lb carbon
 (9) A machine shop employing 225 men is forced to employ 36 per-cent more men. What is the increase in the number of employees?
 (10) If the percent of direct hits out of a bomb load is estimated at 35%, and if 7 direct hits are needed to destroy an objective, how many bombs must be dropped?                                    20 bombs Answer. 
[[bold]] 9. Conversion of common fractions to decimal fractions. [[\bold]] ----a. To convert any fraction to a decimal form, simply add a decimal point on the right of the numerator and perform the indicated division as in paragraph 7g. 
 (1) Example: Express 5/8 as a decimal fraction.
     Solution: .6250/ 8/5.0000 Therefore 5/8 = .625                Answer.
 
                         18