Question 705003

The diameter after $10\%$ increase is $3 + 0.1 \times 3 = 3.3 \text{ cm}$. The number of biscuits that can be placed along the $30 \text{ cm}$ side is $\lfloor 30 / 3.3 \rfloor = 9$. The number of biscuits along the $60 \text{ cm}$ side is $\lfloor 60 / 3.3 \rfloor = 18$. Total biscuits $= 9 \times 18 = 162$.