Question

There are two numbers. If 2490 is subtracted from one number then we get the other number. The algebraic expression depicting this information is:

• A. $a+b=2490$
• B. $a-b=2490$
• C. $x+b+2490=0$
• D. $a–y+2490=0$

Answer 1

The correct option is B

$a-b=2490$

Let the two numbers be $a$ and $b$.

If $2490$ is subtracted from the number, we get $a-2490$

If $2490$ is subtracted from a number we get the other number:
$\Rightarrow a–2490=b$
$\Rightarrow a–b=2490$

The variables can be any two alphabets. They need not necessarily be $x$ and $y$ or $a$ and $b$.