1: The school organized students in grades 5 and 6 to donate money to the earthquake-stricken areas. 1/4 of the fifth-grade donation is equal to 1/5 of the sixth-grade donation, so it can be seen that the sixth grade donated more 120 yuan than the fifth grade. How much did you donate in five or six years?

Answer: (5-4)/9= 1/9.

1/9 of the total donation is 120 yuan.

Level 5 120*4=480

Grade 6 120*5=600

2. The original bananas and mangoes in Guangming Fruit Shop are * * * 450kg, bananas are sold at 75%, mangoes are sold at 80%, and the remaining bananas and mangoes are just equal. How many kilograms is mango?

Answer: let's have one kilogram of mango and b kilograms of banana.

100-75=25, 100-80=20

20a=25b

a+b=450

solve

a=250

b=200

3: Xiaoming and Xiaogang hit 100 rounds in a shooting competition. Xiaoming's 1/3 is six times more than Xiaogang's110. How many times did they fight each other?

Answer: set it to a, just B.

a+b= 100

a/3-b/ 10= 16

The solution is b = 40 and a = 60.

4. Each tie for men is 20 yuan, and each corsage for women is 10 yuan. The ratio of the number of ties and corsage pieces in a store is 3: 2, and the value of * * * is 4,000 yuan. How much does a tie and a chest cost?

A: You need a tie and a corsage.

20a+ 10b=4000

2a=3b

The solution is b = 100 and a = 150.

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