11. Area of square   =   (side)²
    

                         =    (7.5)²
Area of triangle  =  ´ 10 ´ k
                         =   5k
             (7.5)²   =   5 k
                    k   =    11.25


Ans : C

12. Area of the shaded region = Area of an equilateral triangle
    

                              
    

    Ans : E

13. Sum of the first n natural numbers
                         
        =    750 ´ 1501
        =    1125750
    

     

    Ans : B

14. Let the imports of Detroit be x
    Let the exports of Detroit be y
    The new ratio of imports to exports
                     =   
    The new ratio of imports to exports has increased by 15:26.

     

    Ans : A

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