Algebra Test - ...

In a playground, kids are playing in the groups of $$5$$.

If there is one group of kids, then, total number of kids = $$5$$
If there is two group of kids, then, total number of kids = $$5+5 = 5\times 2$$
and so on.

So the total number of kids playing in the playground are
$$5 + 5+5+....= 5\times n$$
Here, the variable $$n$$ is

The non variable part in the expression $$x-18$$ is

$$x = -1$$ is a solution of the equation

Which equation among the following don't have $$(-1)$$ as a solution?

In the expression $$-24x$$, the variable is

Let Arjun bought $$2$$ apple on $$Day \ 1$$.
Then he bought $$4$$ apple on $$Day \ 2$$.
He bought $$6$$ apple on $$Day \ 3$$. And so on.

So we can say, Arjun bought $$2\times N$$ apple on $$Day \ N$$.
Here $$"N"$$ in $$2\times N$$ represents

If $$\dfrac{x+6}{3} = 7$$, what is the value of $$x$$? ( using trail and error method)

What value of $$x$$ that makes the following equation true ( using trail and error method) ?
$$\dfrac{x+5}{2} = 3$$

Find the suitable value of $$x$$ for the following equation by trial and method:
$$2x-21 = 21$$

The non variable part in the expression $$2n$$ is