2016 · Q116
There are two circle of radii r1 and r2 (r1 r2). The area of bigger circle is 693/2 cm2. The difference of their circumference is 22 cm. What is the sum of the diameters of two circles?
General Mental Ability, Quantitative Aptitude and StatisticsNumber system and arithmetic
- A17.5 cm
- B22 cm
- C28.5 cm
- D35 cm
Explanation
πr1² = 693/2 gives r1² = 110.25, so r1 = 10.5 cm. 2π(r1 − r2) = 22 gives r1 − r2 = 3.5, so r2 = 7 cm. Sum of the diameters = 2(10.5 + 7) = 35 cm. Hence (D).