SSC Government Jobs Exams Numerical Ability Area and Volume

Three spherical balls of radius 1cm, 2cm and 3cm are melted to form a single spherical ball. In the process, the loss of material is 25%. The radius of the new ball is

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Ram donated 4% of his income to a charity and deposited 10% of the rest in a Bank. If now he has Rs. 8640 left with him, then his income is If A : B = 2 : 3, B : C = 4 : 5 and C : D = 5 : 9, then A : D is equal to