2.When, $x$ is divided by $10$, the quotient is $y$,with a remainder of $4$. If $x$ and $y$ are both positive integers,what is the remainder when $x$ is divided by $5?$
3.Rubai and Bidushi have some marbles.Bidushi told Rubai ,"if you give me some marbles,I will return one more marble tuan as many as you gave me. "Rubai said,"Alright I will first give you $6 $ marbles.Then Rubai gave Bidushi $6$ marbles and Bidushi returned $7$ marbles to Rubai.Thus after they have exchanged marble $5$ times,Bidushi had no marbles left.How many marbles Bidushi have in the beginning?
4.
Just One difference "mltplied by $3$ " in the place of "multiplied by $4$."
5.
6.A work has to be done in $18$days.A contructor assigned $20$ men to do the tusk.But,after $10$ days it was found that only half of the work was done.So,how many men should he add so that the work will be finshed in time?
7.
Just same as junior $5$.
8.