1. There are 25% more boys than girls. How many boys are there? Column type ()

2. Girls are 20% less than boys. How many boys are there? Column type ()

3. There are 25% more boys than girls. How many people are there in the class? Column type ()

4. There are 20% fewer girls than boys. How many people are there in the class? Column type ()

1. a wire, cut off 40%, leaving 2.4 meters. How long is this wire?

2. A laptop, the current price is 5000 yuan, 20% lower than the original price. How much is the price reduction of this laptop?

6. The qualified rate of products processed by Master Zhang is 99%. There are 245 known qualified products more than unqualified products. How many products has Master Zhang processed?

I. 1, 0,20+20× 5%

2、、 20 ÷( 1 - 20%)

3、 20 × ( 1 + 25%) + 20

4、 20 ÷ ( 1 - 20%) + 20

Second, 1, X-40%X = 2.4 X = 4.

2、5000 ÷ ( 1 - 20%) - 5000 = 1250

The qualified rate is 99%, and the unqualified rate is 1%.

245 ÷ ( 99% - 1%) = 250