A person spends 33000 vnd to buy 10 chicken eggs and 5 duck eggs. Find the price of one chicken egg and the price of one duck egg ? Such that the price of 5 chicken eggs is 7500 vnd more than the price of two duck eggs .

An and Hung have 82000vnd. After An buys $\frac{4}{7}$ of her money and Hung buys $\frac{2}{5}$ of his money, the remaining money of Hung is 6000 more than An. Find An’s money at first ?

Find X; Y; Z such that : $\frac{X-1}{2}=\frac{Y-2}{3}=\frac{Z-3}{4}$ và 2 x X  + 3 x Y – z = 50

Find X such that X + Y + Z = 350 và $\frac{6}{7}\times X=\frac{9}{11}\times Y=\frac{2}{3}\times Z$

There are three classes, they plant 230 trees totally. Such that if class 4A plants 3 trees, class 4B plants 2 trees and if class 4B plants 3 trees, class 4C plants 4 trees. How many tree does class 4C plant ?

In the garden, they plant 120 trees totally, consist of orange, lemon and mango. Such that the number of oranges is $\frac{2}{3}$ the number of lemons and mangos, the number of manges is $\frac{1}{5}$ the number of lemons and oranges. How many lemons are there ?

Hue , Hang and Mai go to plant tree. Such that the sum of trees of three person plant is 17 trees. The number of trees of Hue and Hang is three trees more than Mai. The number of trees of Hue is $\frac{2}{3}$ the number of trees of Hang. How many trees does Mai plant ?

Two man divide 425000 vnd each other. After the first man spends $\frac{1}{6}$ of his money, the second man spends $\frac{1}{7}$ of his money, the second man is 60 000 vnd more than the first man. How many moneys does the first man have ? ( vnd )

Given the expression : A = $\frac{1}{2}+\frac{1}{6}+\frac{1}{12}+\frac{1}{20}+\frac{1}{30}+...+\frac{1}{n}$ . Such that : A = $\frac{49}{50}$ . Find the value of n ?

A store buys 200 both crab and frog. Such that the number leg of crab is 180 more than the number leg of frog. How many frogs are there ( counting that nipper of crab as leg of crab ) ?

There are 145 cents with denomination 5000vnd, 2000vnd and 1000vnd. The value of 145 cents is 312 000 vnd. The number of cent with denomination 2000vnd is 2 times the number of cent with denomination 1000vnd. How many cents with denomination 5000vnd are there ?

A person made some of product.The first day sold $\frac{3}{7}$ of product, if the price is 18000 vnd/product , the interest rate is 54 000vnd. The second day sold $\frac{2}{3}$ of the remaining product, if the price is 20000 vnd/product, the interest rate is 80 000 vnd. Find the sum of product is sold ?

The sum of two consecutive numbers is 3 times the difference of them and is a half the product of them. Find the greater number ?

The sum of chickens and ducks is 148. The product of them is 4747. Find the number of chicken ? ( Such that the number of chicken is more than the number of duck )

Find the greater such that the product of two numbers is 540 and the greater is $\frac{5}{3}$ the smaller ?