Write the expression for the following:

$56$ added to double of $x$

Write the expression for the following:

$-3$ multiplied by $y$ and the result added to $18$

Write the expression for the following:

$p$divided by $4$

Change the following statement using expression into statement in ordinary language:

In a class there are $n$ girls and $3n$ boys.

Change the following statement using expression into statement in ordinary language:

The cost of a bike is $n$ and the cost of a car is $12n$.

Change the following statement using expression into statement in ordinary language:

Ravi is $x years$old. His father is $5x$ years old and his mother is $5x-4$ years old

Change the following statement using expression into statement in ordinary language:

In a contingent of Army there are $n$ rows.Each row contain $2n$ soldiers