(X+22)/(8X-22)=2/5

5*(X+22)=2*(8X-22)

5X+ 1 10 = 16X-44

1 1X= 154

X= 14

8X=8* 14= 1 12

The home appliance department of this shopping mall used to have 14 delivery staff and 1 12 sales staff.

2. 1 1. 1 1%

Calculation: the price of a commodity before the price reduction is a yuan, after the price reduction is A( 1- 10%) yuan, the sales volume before the price reduction is a, and after the price reduction is b, then aa = a (1-kloc-0/0%) b, and then B = A/( 10%).

So the sales volume will increase by 1 1%.

3.

At 10 in the morning, they were still 36 kilometers apart, and at noon 12, they were 36 kilometers apart.

They didn't meet at 10 in the morning, but at noon 12.

From 10 in the morning to 12 in the afternoon, the sum of the distances they walked was 36+36=72km.

The distance between two people in an hour is 72/( 12- 10)=36km.

From 8 am to noon 12, the distance between them is 36 kilometers.

Then let the distance between a and b be x.

(x+36)/36=4

x/36+ 1=4

x= 108

A: The distance between A and B is 108km.

Answer supplement

In the equation, 4 refers to the time from 8 am to noon 12.

( 12-8)