What is the algebraic expression for "two-thirds of $n$ decreased by $4$ times $a$".

"$8$ times a number $n$", as an algebraic expression equals _____.

The mathematical operation you would observe to write an algebraic expression for "$8$ less than a number" is _____.  $\left(\mathrm{Subtraction} / \mathrm{Addition} / \mathrm{Multiplication}\right)$

The value of the expression $25-g$ for $g=13$ is _____.

The next number in the sequence $50, 49, 47, 44, 40,...$ is _____.

Match the following:

Match the pattern in Column A with the rule that gives the number of matchsticks required to make the corresponding pattern in column B. ($n$ represent the number of matchsticks used in one letter.)

	Column A		Column B
(i)	A pattern of letter T as	(a)	$6n$
(ii)	A pattern of letter U as	(b)	$5n$
(iii)	A pattern of letter S as	(c)	$2n$
(iv)	A pattern of letter R as	(d)	$3n$

Answer the following questions.

Take Karishma's present age to be $a$ years 

What will be her age $7$ years from now?

Answer the following questions.

Take Karishma's present age to be $a$ years 

What was her age $10$ years back?