1, father is 45 years old and son is 23 years old. A few years ago, my father was twice as old as my son.

2. Miss Li is 8 years older than her. 10 years ago, Miss Li's age was the same as that of 8 years later. How old are Miss Li and Wang Gang?

Three years later, the sum of the two sisters' ages is 27 years old, and the younger sister's age is exactly half that of the older sister. How old are the sisters?

The elephant asked his mother, "Mom, how old were you when I grew up to your present age?" Mom replied, "I'm 28 years old." The elephant asked again, "How old was I when you were my age?" Mom replied, "You are only 1 year old." How old is mother elephant?

The giant panda is three times as old as the little panda. In four years, the sum of the ages of the giant panda and the red panda will be 28 years old. How old are pandas and pandas?

6. Before15, the father's age was seven times that of his son, and after 10, the father's age was twice that of his son. Ask father and son how old they are.

7. Wang Tao's grandfather is two years older than his grandmother, his father is two years older than his mother, and a family of five is 200 years old. It is known that grandpa was five times as old as Wang Tao and his father was four times as old as Wang Tao four years ago. How old is Wang Tao's family?

Answer:

1, a year ago.

2. Liu Hong 10 years old, Miss Li is 28 years old.

(10+8-8) ÷ (2-1) =10 (years old).

My sister is 7 years old. Sister 14 years old.

[27-(3×2)]⊙(2+ 1)= 7 (years).

4. Elephant 10 years old, mother 19 years old.

(28-1) ÷ 3+1=10 (years old).

5. Giant panda 15 years old, red panda 5 years old.

(28-4×2)÷(3+ 1)=5 (years).

6. The father is 50 years old and the son is 20 years old.

(15+10) ÷ (7-2)+15 = 20 (years old)

7. Wang Tao 12 years old, mother is 34 years old. Dad is 36, grandma is 58 and grandpa is 60.

Tip: Dad was four times as old as Wang Tao four years ago, so now he is four times as old as Wang Tao, 12 years younger.

(200+2+12+12+2) ÷ (1+5+4+4) =12 (years old).

Application of harmony and multiple problems

1. Xiao Wei has 20 rabbits at home, of which the number of big rabbits is four times that of small rabbits. How many rabbits and big rabbits are there in Xiao Wei's house?

2. The sum of dividend, divisor and quotient is 2 12, and the known quotient is 2. What are the dividend and divisor respectively?

3. There are 2 18 students in grade four and five in a school, and the number of students in grade five is 22 times less than that in grade four. How many students are there in Grade 4 and Grade 5?

4. When two numbers are divided, the quotient is greater than 3. If the dividend, divisor, quotient and remainder are added, the total is 43. Find the dividend and divisor.

My sister has 38 comic books, and my sister has 52 comic books. How many cartoons does my sister have to give to make my sister have twice as many books as her sister?

6. Two boxes of tea * * * 176kg, take out 30kg from box A and put it into box B, the kilogram of box B is three times that of box A ... How many kilograms are two boxes of original tea?

7. The number A is three times that of B, the number C is four times that of B, the number D is half that of C, and the sum of the four numbers is 1040. What is the number d?

8. The sum of four numbers is 408. These four numbers are divisible by 2, 3, 5 and 7 respectively, and their quotients are the same. What are these four numbers?

9. The divisor quotient of two numbers is 9, and there is no remainder. The sum of dividend, divisor and quotient is 89. What is the divisor?

10, there are three piles of coal, pile A is 30kg more than pile B, pile C is less than pile B15kg, and three piles of coal are * * * 240kg. So, how many kilograms of coal is there in pile A?

Application of differential multiple problems

1. There are 78 more female workers than male workers in the garment factory, and the number of female workers is three times that of male workers. How many male and female workers are there?

2. There are 50 more students in Grade Five than in Grade Six, and the number of students in Grade Five is twice that of Grade Six. How many students are there in Grade 5 and Grade 6 respectively?

Decimal: difference ÷ (multiple-1)

Large number: decimal × multiple or difference+decimal

There are two baskets of apples. The first basket is 26 kilograms heavier than the second basket, and the weight of the first basket is twice that of the second basket. How many kilograms are there in each basket?

4. There are more peach trees in the orchard than apricot trees 170, and the number of peach trees is three times that of apricot trees. How many trees have been planted?

5, two baskets of pears, the first basket is 5 1 kg more than the second basket, and the first basket is twice as much as the second basket. How many kilograms are there in each basket?

6. Obviously more than Xiaohua 12 watercolor pen. Mingming's watercolor pen is twice that of Xiaohua. What is the difference between Mingming and Xiaohua?

7. The difference between two numbers is 60, and the large number is 7 times the decimal number. What is the big number? What is the decimal number?

8. Xiaohong has more lucky money in 400 yuan than Xiaoming. Xiaohong has three times as much money as Xiaoming. How much money does Xiaohong and Xiaoming each have?

9. Warehouse A stores 240 kilograms more grain than warehouse B. Warehouse A stores four times as much grain as warehouse B. How many kilograms do the two warehouses store?

10. In a primary school, there are 332 more boys than girls, twice as many as girls. How many boys and girls are there in this primary school?