Calculate the product of 98 fractions of the following sequence :

$\frac{4}{3}\times \frac{9}{8}\times \frac{16}{15}\times \frac{25}{24}\times ...\times \frac{9604}{9603}\times \frac{9801}{9800}$

( Write the result as a/b )

Calculate: A=  $\frac{2008+\frac{2007}{2}+\frac{2006}{3}+\frac{2005}{4}+...+\frac{2}{2007}+\frac{1}{2008}}{\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+...+\frac{1}{2008}+\frac{1}{2009}}$  

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 shop sold 75 bottle of oil, each bottle has $\frac{2}{5}$ liters oil. Such that the weight of each liter oil is $\frac{9}{10}$ kg. How many liters oil did the shop sell ?

A team has 60 friends, $\frac{3}{5}$ the number of friends is girls among them. How many girls are there ? How many boys are there ?

A person sold 63 kg rice in 4 times. The first time sold $\frac{1}{2}$ the number of rice and $\frac{1}{2}$kg. The second time sold $\frac{1}{2}$the number of other rice and $\frac{1}{2}$kg. The third time sold $\frac{1}{2}$ the number of other rice and $\frac{1}{2}$kg. How many kilograms rice sold in four time ?

Find x such that:
$\frac{3}{4}:\frac{6}{x}:\frac{8}{7}=\frac{3}{8}:\frac{4}{5}:\frac{6}{7}$

Find x such that:

$\frac{2}{5}:\frac{x}{3}:\frac{7}{4}=\frac{24}{315}$

A person sold $\frac{5}{6}$quintal rice, know that the number of sticky rice is$\frac{1}{3}$ quintal fewer than ordinary rice. How many quintals sticky rice 

A person raises 200 chicken. After selling 20 cocks and buying 30 hens then the number of cocks is $\frac{3}{4}$ the number of hens. How many cocks raise originally ? How many hens raise originally ? 

The sum of two numbers is 2010. Find the two numbers, know that the greater number is decreased by 5 times we have a smaller number ? 

There are four boxes of sweet. The first box and the second box have $\frac{5}{6}$kg sweet; the second box and the third box have $\frac{1}{2}$kg sweet; the third box and the first box have $\frac{2}{3}$kg sweet. How many kilograms sweet in each box ?

Find the fraction $\frac{a}{b}$ is equal to the fraction $\frac{3996}{5439}$; such that a + b = 596

Find the difference 3 – digit number $\overline{abc}$, such that: $\frac{\overline{ab}}{\overline{c2}}=\frac{69}{92}$ 

The product of two irreducible fraction is $\frac{3}{5}$. Find the two fractions, such that the first factor is no change, the second factor decreased by $\frac{2}{3}$then the new product is equal to $\frac{1}{10}$. ( Write the result as a/b )