How many factors of 240 are also multiples of 3 ?	Choose the correct choice:  A) 5  B) 8  C) 9  D) 10  E) 20
take factors of 240   240= 2^4*3^1*5^1   Total factors of 240= (4+1)*(1+1)*(1+1)   =5*2*2= 
<gadget id="calculator">5*2*2</gadget>
<output>20</output>
20   out of total factors of 20, half will have 0 as power of 3 and half will have 1 as power of 3. It is because we have considered only 0 and 1 as power of 3 to compute total factors of 240.   Therefore factors that are multiple of 3= 20/2= 
<gadget id="calculator">20/2</gadget>
<output>10</output>
10   Ans - 10
<result>D</result>
How many factors of 240 are also multiples of 3 ?