Question

一道英语的数学题求详细步骤

一道英语的数学题求详细步骤A neighbor of mine has a lawn that isn't looking too good. The picture below shows an overhead image of his house and yard.

He has decided to remove all the old sod (grass), bring in a new 4 inch layer of topsoil, install new in-ground sprinklers, and reseed the lawn. He seems to think that he'll be able to save money by hauling loads of topsoil from the store himself in his pickup truck, rather than paying for delivery, but I don't think he's right. You're going to help us settle this.

Here is some information you may need:

Is he redoing the whole yard or just the front?
He's redoing the whole yard
How much topsoil does he need?
I'm not sure, you'll have to figure that out. Remember he's putting a new 4 inch layer down over all the area currently covered by grass in the overhead picture above.
How big is the yard?
I'm not sure, but you can probably estimate it using the overhead picture.
What kind of pickup truck does he drive?
A 2003 Ford F-150 XL.
How much can the pickup carry?
The truck bed is 80 inches long, 69 inches wide, and 20 inches tall.
How much is the delivery charge?
$30 per truckload on top of the soil cost. Each truckload can deliver up to 18 cubic yards.
How much does the topsoil cost?
$18 per cubic yard (sold in 1/4 yard increments).
How far is the soil store?
It is 9 miles away. It takes about 20 minutes to drive there.
What gas mileage does the pickup truck get?
It averages 17 miles to the gallon.
What is the current gas cost?
Assume it's $3.79/gallon.
Using this information, figure out whether my neighbor will save money by picking up the soil himself. Use the results of your calculations to guide your decision: would you recommend that my neighbor pick up the soil himself, or pay for delivery?

Detail all your assumptions and calculations, and clearly write out your final conclusions.

Answer 1

需要处理的场地为外红虚线框内的区域，减去内部房屋占地区域。

全部转换为国际单位制计算。

房屋占地面积=15.45*9.09+6.82*3.19=162.20m²

空地总面积=22.73*32.82=746.00m²

需要处理的面积=746.00-162.20=583.80m²

新土厚度为4英寸，乘面积，共需土方=59.31m³

租车方案：

每车18cubic yards=13.762m³

共需：4.31车，需要运送5次，共$150，可能再有一点折扣。

自己装运：

卡车每车运送80*69*20cubic inches=1.809m³，

共运需运送59.31/1.809=32.79车，运送33次。

总路程(考虑往返)=33*9miles*2=594miles

油费=3.79*594/17=$132.43

直接费用比雇用别人运输略省钱，但考虑人工费用，装车，运送要往返多次，至少耗时22小时，不如“pay for delivery”.

Answer 2

这段英文翻译出来是样的：
我的邻居有一块看起来不太好看的草坪。下图显示了他的房子和院子的架空图像。他决定去掉所有旧草皮（草皮），再加上一个新的4英寸厚的顶层…
但是没有问题，不知道要算什么 ？

Answer 3

lan ，点问题后面的展开：）