A rectangular field ABCD has a flower garden which is 18 feet by 6 feet. If the garden covers 30 percent of the field, what is the area, in square feet, of the field?
                            
                         
                        
                            
                        
                             
                            
                            
                            
                                Explanation
                            
                                
                                    Answer C:  The area of the garden is equal to 18X6=108, garden is 30% of the field. As 30% is equal to 108, 100% is equal to 108/30X100=360.
Key takeaway:  Area of rectangle is equal to length X width. Questions based on area of standard geometrical figures such as rectangle, square, triangle, circle, etc are asked. List out their formulae and practice over them.