Question

The sum of two numbers is 60. If one number is 40, then the other number is

• A. 40
• B. 30
• C. 20
• D. 10

Answer 1

The correct option is C

20

Let the two numbers be $x$ and $y$.

We know, $x+y$ = 60 and $y$ = 40.

We need to find $x$.
We know, $(x+y)–y=x$
i.e., 60 – 40 = $x$
$⟹$ $x$ = 20