Hi Samira,
Translate it from words to algebraic equations, then solve the equations.
Here's how I would do it:
"one half of a number": Call the number X, then 1/2 of a number is X/2.
"is subtracted from": means we will subtract X/2 FROM something.
"the sum of one third and one quarter": that's (1/3 + 1/4).
"of the same number": That's X again.
"The result is 16". That means " = 16"
So putting it all together,
(1/3+1/4)X  X/2 = 16.
Can you solve the rest yourself?
Stephen La Rocque.
