Re: [計量] 我還有問題想要請教?
: 請教別題?
: 1.the daily rate for a hotel that sleeps 4 people is $39 for one person and X
: dollars for each additional person.if 3 people take the room for only one day
: and each pays $21 for the room,what is the value of X?
: a)6 b)8 c)12 d)13 e)24
[ 39 + ( 3 - 1 ) * X ] / 3 = 21 → X = 12
: 2.s is the sum of three consecutive integers,the greatest of which is X.in
: terms of s,which of the following is the sum of three consecutive integers,
: the least of which is X?
: a)s-6 b)s-3 c)s+3 d)s+6 e)2s
s = X + X - 1 + X - 2 → 3X = s + 3
X + X + 1 + X + 2 = 3X + 3 = s + 6
: 3.an emergency vehicle travels 10 miles at a speed of of 50 miles per hour.
: how fast must the vehicle travel on the return trip if the round trip
: travel time is to be 20 mins?
: a)55mph b)60mph c)65mph d)70mph e)75mph
: Ans:距離=時間*速率
: 我是把去程的時間算出來了，需要12mins
: 然後我就搞不懂了><"
去程時間：12 min，回程只能跑 8 min
故回程速度 10 miles / 8 mins = 10 miles / ( 2/15 hr. ) = 75 mph
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