1. In order to alleviate traffic congestion, a city is widening its roads. The width of Jiefang Road has increased from 10m to 25m, which percentage has it been widened?

Increased (25-10) ÷10 =1.5 =150%;

2. Xiaohua has read 65% of the total pages of a book, and the number of pages read is 90 more than the rest. How many pages are there in this book?

* * * is: 90 ÷ 65%-(1-65%) = 90 ÷ 0.3 = 300 pages;

3. In general, the mass of ice with the same volume is less than that of water 10%. There is a piece of ice and a bucket of water of the same volume. If the mass of this ice is 9 kilograms, how many kilograms is the mass of this bucket of water?

Water = 9 ÷ (1-10%) = 9 ÷ 0.9 =10 kg.

solve an equation

x+20%x= 120

Solution: 1.2x= 120.

x= 120 1.2

x= 100

65%x-20%x=9

Solution: 0.45x=9

x = 9÷ 0.45

x=20

x-50%x= 100

Solution: 0.5x= 100

x= 100÷0.5

x=200

12x=26= 170

Solution: The problem is wrong.