find the average of first 20 multiples of 7? Pick one.
A) 73.5 B) 56.4 C) 25.8 D) 12.4 E) 56.9
Required average =7(1+2+3+…….+20)/20   =(7*20*21)/(20*2)   =(147/2)=73.5.   73.5ns: 73.5
<result>A</result>
find the average of first 20 multiples of 7?