How many plants will be there in a circular bed whose outer edge measure 30 cms, allowing 4 cm2 for each plant ?  Choose the correct choice from the following options.
A) 18 B) 750 C) 24 D) 120 E) none of these

Rationale: "circumference of circular bed = 30 cm area of circular bed = ( 30 ) 2 ⁄ 4 π space for each plant = 4 cm 2 ∴ required number of plants = ( 30 ) 2 ⁄ 4 π ÷ 4 = 17.89 = 18 ( approx ) answer a"
Answer: A