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A car traveled 462 miles per tankful of gasoline on the highway and 336 miles per tankful of gasoline in the city. If the car traveled 6 fewer miles per gallon in the city than on the highway ,how many miles per gallon did the car travel in the city?
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设X为gallon of gasoline used
462/x-336/x=6
得到x=21
说明per tankful里面有21gallon的油
在城市里的mile为336,gallon已知为21
mile per gallon=336/21=16
小良冠二郎
Assume x miles per gallon on the highway, then 462/x = 336/(x-6).
rhetoric
设一满箱油有n加仑 城市行驶时每加仑油能跑x公里 那么在高速上每加仑油能跑x+6公里 可以得到 n*x=336 n*(x+6)=462 联立就能求出n=21,接着求出x为16
啊啊我想读书
一辆汽车在高速公路上每罐汽油行驶 462 英里,在城市每罐汽油行驶 336 英里。 如果汽车在城市中每加仑行驶的里程比在高速公路上少 6 英里,那么汽车在城市中每加仑行驶了多少英里?
Eeesaaa
设: 1tank有x gallon; 在highway跑 a miles/gallon, 在City跑 (a-6) miles/gallon highway:x * a=462 city: x * (a-6) = 336 ax-(ax-6x)=462-336 解方程可以得出x=21 遇到效率题可以在计算和理清关系时把单位带上!跟着计算一起约分!
贾思敏
比例问题:h-c=6, 也就是h=c+6 h/c=(c+6)/c=462/336 解开方程即可
WZQ77
要找到破题点,即一箱有多少gallon的油
杀鸡迫在眉睫
核心桥梁:gallon of gasoline per tank,即每跑一箱是多少gallon的油; 设每tank多少gallon为x,然后求出x值后,因为问city能每gallon跑多少miles,所以用city的每tank跑336 miles去除以x的每tank多少gallon,能得出city的每gallon多少miles。
sjz
每小时城市和高速差6公里,所以(462-336)/6=21,所以总共跑了21小时,那么城市的耗油=路程除以时间=336/21=16加仑每小时,切记算的时候带上单位以防看走眼
joanna_mi
假设1 tank有x gallon : 462/x = 336/t + 6
joanna_mi回复joanna_mi
336/x
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2019-10-20 06:23:30
leeleeleee
单位题!!!只要是单位一样,在比例面前都是纸老虎。 City:Highway=336m/t:462m/t=单位一样,消消消=8:11,。就像买东西,同一个东西,不管单位是美元还是rmb,都花的是那么多钱,所以同一个车,一段距离,消耗的油是一定的.告诉我们c比h少用6m/g。 这个6就代表着比列3(11-8=3)因为c:fewer=8:3, 算一算,c是多少呢。
贾思敏回复leeleeleee
很神
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2021-08-28 16:57:42
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