A rope can make 70 rounds of the circumference of a cylinder whose radius of the base is 14cm. how many times can it go round a cylinder having radius 20 cm?	Options:
A) 49 rounds	B) 42 rounds	C) 54 rounds	D) 52 rounds	E) 50 rounds
Explanation:   Let the required number of rounds be x   More radius, less rounds (Indirect proportion)   Hence we can write as   (radius) 14 : 20 :: x : 70   ⇒14×70=20x   ⇒14×7=2x   ⇒x=7×7=49   49 roundsnswer: Option 49 rounds
<result>A</result>
A rope can make 70 rounds of the circumference of a cylinder whose radius of the base is 14cm. how many times can it go round a cylinder having radius 20 cm?