Q. A simple interest of Rs.480 is obtained on a certain sum at a fixed rate for a certain time. If the sum is increased by 20%, the duration of time is made two-third and the rate of interest is ...

Correct Answer: 4:9 Explanation: Surface areas = 2Ï€r(r+h) = 2*4Ï€rÂ² r+h = 4r h = 3r Volume - 4/3 * Ï€*rÂ³ : Ï€rÂ²*h 4/3 : 3 4 : 9

## Ritika

Correct Answer:Â 9 cm Explanation: 10/5 = 18/EF EF = 9 cm.