单项选择题

The illumination E， in foot candles，provided by a light source of intensity I，in candles，at a distance D，in feet，iSgiven by
For an illumination of50 foot candles at a distance of 4 feet from a source，the intensity of the source must be（）

A. 50 candles
B. 200 candles
C. 800 candles
D. 1，600 candles
E. 2，500 candies

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单项选择题

To obtain an FHA mortgage for $50，000or more，the home buyer must have adown payment equal to 4 percent of the first $25，000 of the mortgage amount and5 percent of the portion in excess of$25，000．At settlement the buyer pays a mortgage insurance premium equal to 3percent of the mortgage amount．What is the maximum FHA mortgage．if any．A buyer can obtain if the buyer has only$6，000 available for the down payment and insurance premium（）

A. $62，500
B. $71，875
C. $78，125
D. $125，000
E. The home buyer cannot obtain an FHA mortgage．

单项选择题

Of the 400 cadets in a graduating class，30percent were w。men and，of these，became instructors．If the number of men who became instructors was twice the number of women who became instructors，how many of the men became instructors？（）

A. 120
B. 48
C. 40
D. 24
E. 20

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