X-5 = 60% X- 1 X-60% X =- 1+5 40% X = 4 X = 10

Answer: The original length of this rope is 10 meter.

If there are x pear trees, there are 80%X apple trees.

X+80%X=450 180%X=450 x=250

There are 250 pear trees and 200 apple trees.

3. Let the cost be X yuan.

140 * 90% * 26% = 140 * 26%-X 32.76 = 126-X X = 126-32.76 X = 93.24

A: The charge is 93.24 yuan.