Question

When each side of a square is reduced by 3 cm, the area becomes 49 sq cm. The side of the original square is ___ cm.

• A. 10
• B. 5
• C. 12
• D. 8

Answer 1

The correct option is A

10

Let the side of original square be $x$

Area of new square = 49 sq cm

$(x-3{)}^2=49$

$x-3=7$

$x=10$ cm