Question

$\ast 025$ is square of $55$.What digit should replace $\ast$?

• A. $1$
• B. $2$
• C. $3$
• D. $4$

Answer 1

Answer: (C)

$3$

Step 1:

Multiply ten's digit with its next number.
$5\times (5+1)=5\times 6=30---\left(1\right)$
Step 2:Find the square of unit's digit: 5
$5^2$ = 25 ----(2)
Step 3 :

Joining (1) and (2), we get
$3025=55\times 55$
So, 3 is the missing number.