There are 27 people going for an outing. They want to rent a car. A big car can hold 8 people, and a car can hold 80 yuan. A small car can hold 4 people, and a car can hold 50 yuan What's the cheapest way to rent a car?

There are 27 people going for an outing. They want to rent a car. A big car can hold 8 people, and a car can hold 80 yuan. A small car can hold 4 people, and a car can hold 50 yuan What's the cheapest way to rent a car?

How to solve the problem:
The unit price of big car is 10 yuan / person, and the unit price of small car is 12.5 yuan / person. So from an economic point of view, try to rent big car
Formula: 27 / 8 = 3, more than 3
The remaining three people can take a small car, so the result: three big cars and a small car are the cheapest
The cost is: 3 * 80 + 50 * 1
=240+50
=290 yuan
The car moves uniformly on the horizontal road at the speed of V0 = 10m / s, and the speed changes to 6m / s after braking for 2S. Find: (1) the forward distance within 2S after braking and the acceleration during braking; (2) the time for 9m after braking; (3) the forward distance within 8s after braking
(1) The acceleration after braking is a = V − v0t = 6 − 102m / S2 = − 2m / S2. X = v0t + 12at2 = 10 × 2 − 12 × 2 × 4m = 16m. Therefore, the forward distance within 2S after braking is 16m, and the braking acceleration is - 2m / S2. (2) according to x = v0t + 12at2, substituting the data, 9 = 10t − 12 × 2t2, then t = 1s or T = 9s
The car runs at a uniform speed of 10m / s on a straight road, and the speed changes to 6m / s after braking for 2S. The calculation is as follows: (1) the acceleration during braking and the forward distance within 2S after braking; (2) the time taken to advance 9m after braking; (3) the forward distance within 8s after braking
(1) According to the average speed formula of uniform variable speed linear motion, the forward distance within 2 seconds after braking: x =. VT = V0 + v2t = 10 + 62 × 2 = 16m, according to the speed time formula of uniform variable speed linear motion: v = V0 + at: a = 6 − 102 = - 2m / S2 (2) the time from braking to stopping is: t0 = 0 − 10 − 2 = 5S, according to x = v0t
From city a to city B, the bus took 6 hours to travel for a quarter of the whole journey, and then for 4 hours. How many parts of the whole journey did it take?
Hurry!
A, B and C race. A is one tenth faster than B, and C is one tenth slower than B. how many times faster is a than C?
It's a practical problem
We need to work out the formula
1. 6 hours 1 / 4, then 1 / 4 △ 6 = 1 / 24 per hour, then another 4 hours is 4 * 1 / 24 = 1 / 6, a total of 1 / 4 + 1 / 6 = 3 / 12 + 2 / 12 = 5 / 12
2. Let B speed be 1, then a is 11 / 10, C is 9 / 10, so 11 / 10 △ 9 / 10 = 11 / 9
A is 11 / 9 times as much as C
There are two warehouses, one fourth of a's stock is equal to two fifths of B's stock. The stock of a is 120 tons more than that of B. what's the stock of B?
200 tons simple
If B is 100t, then 2 / 5 = 40t, 1 / 4 of a is 40t, a is 160t, 160t-100t = 60t, 60t is 120t is 1 / 2, so B 100t is half smaller than the actual. B should be 100t * 2 = 200t
How to arrange the numbers 1-9 in the nine spaces so that the sum of horizontal, vertical and oblique lines is equal to 15?
Six hundred and eighteen
Seven hundred and fifty-three
Two hundred and ninety-four
Two hundred and seventy-six
Nine hundred and fifty-one
Four hundred and thirty-eight
Four hundred and ninety-two
Three hundred and fifty-seven
Eight hundred and sixteen
Six hundred and eighteen
Seven hundred and fifty-three
Two hundred and ninety-four
1. Xiao Ming read a story book. On the first day, he read 24 pages, accounting for one fifth of the whole book. On the second day, he read 37.5% of the whole book. How many pages are left?
2. For a conical sand pile, the circumference of the bottom circle is 12.56 meters and 5 meters. Spread all the sand in a rectangular pit of the school, which is 6.28 meters long and 2 meters wide. How thick can the sand be spread on average?
Make a list
.
Don't you want answers?
1 24/0.2-120*0.375-24=51
2 （12.56/3.14/2 *2*3.14*1.5）/12.56=1.5
/You should know the difference between * and others
Remember to adopt it
The car's speed is 20 meters per second, and the cheetah's speed is 31 meters per second. What fraction of the car's speed is the cheetah's speed?
31 / 20 or 11 / 20
There is a difference of 24 tons between the two warehouses. 20% of the inventory is delivered by Party A and 25% by Party B. the inventory quantity of the two warehouses is equal?
To write the process clearly, the correct number is 744
24*(1-25%)/[（1-20%）-（1-25%）]=360
A warehouse 360 tons
360+24=384
B warehouse 384 tons
360 + 384 = 744 tons
There are 744 tons in the two warehouses
Let B be x and a be y, then:
X-Y=24
{
X（1-25%）=Y（1-20%）
The solution is y = 384
384+360=744
Fill 4, 6, 7, 8, 9 and 10 in the space of three rows and three columns, so that the sum of the three numbers in the horizontal, vertical and oblique rows is 18?
There should be nine numbers in three rows and three columns. You only gave six