[求助]

nan

OG -math section-problem solving,  question no.350, i can't understand, anyone can explain????
thanks!!

陈月麟

Hi Nan,

Is it the one on Retail Price? Do you have OG? Explanation is inside the OG.- Pg 209.

nan

yes, i have OG, but i don"t understand the explaination
why is (p+1)(n-10)=120??

陈月麟

Hi Nan,

(p+1)(n-10)=120 means

If current price of each towel were to increase by $1, 10 fewer of the towels could be bought for $120. (this is in the question)

This means that total price is unchanged. p is the price per towel and n is the number of towels.

If still unclear, pls ask. Sorry (my Chinese typing is slow). Thank you.

nan

我是不是太笨了, 还是不明白??????

nan

10 和1 侍从哪里来的??

陈月麟

题目里说：
“如果每条手巾的售价要增加 $1,而手巾售量比原本少了10件，”代表为，

（p+1)(n-10)=120

nan

气死窝了!!!
看惯乐德国的小数点是逗号, 窝已为$1,10....是$1.10!!!!
窝还为这是错题讷!!!!!