加急加急~！！急问两道新狗狗~~

bridget917

一道是：
PS：一个混合物的成分是Walnut，Almond和Chocolate，他们的重量和单价分别是（有图表）（w，3.5），（a，4），（c，4.5）。In the mixture, there is three times as much walnut as almond and there is twice as much chocolate as almond. The total cost of the mixture can be expressed in term of a as ?
他们之间的关系到底是怎样的？three times as much walnut as alomd到底是谁是谁的3倍呢？

还有一道是那个电话号码的
3447个数字组成电话号码，前面3个数字是固定的，比如说912，问至少有多少个数字备选才能有28200种选择
A 28 B29 C 282 D280 E290


大家快来都看看呀~~

bridget917

顶啊顶~