This year, Yasmin moved the boundary:

She decided to change the rectangular pea bed into a square, by lengthening one of its sides by $3\text{m}$.

As a result of this, the area of the strawberry patch was reduced by $15\text{m}^2$.


What was the original area of the pea bed, before the change in the boundary?




If you liked this problem, here is an NRICH task that challenges you to use similar mathematical ideas.