[計量] pp3 test2
The scale drawing of certain room is rectangle 5 inches by 6 inches. If the
drawing has the scale 1/4 inch to 1 foot, which of the following will give the
actual number of square feet of the room?
(a) 1+7/8
(b) 7+1/2
(c) 90
(d) 120
(e) 480
ans : 480
看不懂題目...
Two different integers are to be selected from a set of 10 different integers
in which half of the integers are even and half are odd.
How many of the 45 possible selections consist of one even
and one odd integer?
ans : 25
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