The brothers has 36 marbles altogether. After that he gave $\frac{1}{2}$ his the number of marbles for younger brother so that is 3 marbles less than $\frac{1}{2}$ the number of marbles of younger brother at that time. How many marbles do each of the person have at first ?

Two vans transported goods, the first van transported 2400 kg goods less than the second van. Such that $\frac{1}{4}$ of the number of goods which the first van transported is $\frac{1}{7}$ of that of the second van. How many goods did each of the two vans transport?

The length of a rectangle is $\frac{3}{2}$of it’s the width. If the width is increases by 20m, the rectangle becomes a square. What is the area of the rectangle ?

The number of female students is double the number of male students in a class. If transfers 3 female students, the number of female students is 7 more than the number of the male students. How many students are there in the class ?

A chicken farm such that the number of hens is 345 more than the number of cocks. After buying more 25 cocks then the number of cocks is $\frac{3}{7}$of that of hens. How many chickens are altogether at first  ?

The first number is 51 units more than the second number. If the first number is increases by 18 units then the first number is 4 times the second number. Find the two numbers ?

There are two boxes of candy. Such that $\frac{1}{5}$of the number of candies in the first box is $\frac{1}{3}$of that of the second box. Also the fisrt box is 46 candies more than the second box. How many candies are there in both boxes altogether ?

The difference of two numbers is 54. Their quotient is 7. Find the sum of two numbers ?

A father is 30 years older than his daughter. The daughter’s age is $\frac{3}{8}$ of the father’s age. Find their ages.

The difference between two numbers is the greatest 2 – digit number. Their ratio is $\frac{7}{4}$ . Find the two numbers.

Viết số x biết : x = 8 $\times $ 100000 + 2 $\times $ 1000 + 6  $\times $ 10 +7

x =...................

Lớp nghìn của số 19951986 là những chữ số nào ?

Viết số gồm có : 4 trăm triệu, 9 trăm nghìn, 3 chục, 2 đơn vị :...................................

Viết số gồm có : 4 chục triệu, 7 trăm nghìn, 9 đơn vị : ......................................

Viết số gồm có : 9 triệu, 3 trăm nghìn,  6 trăm : ............................