How many plants will be there in a circular bed whose outer edge measure 31 cms, allowing 4 cm2 for each plant ?  Choose the correct choice from the following
A) 19  B) 750  C) 24  D) 120  E) none of these

Rationale: circumference of circular bed = 31 cm area of circular bed = ( 31 ) 2 â  „ 4 ï € space for each plant = 4 cm 2 â ˆ ´ required number of plants = ( 31 ) 2 â  „ 4 ï € ã · 4 = 19.11 = 19 ( approx ) answer a
Answer: A