Of three numbers, the third is twice the second and the second is 4 times the first. If their average is 78, the greatest of the three numbers is:	Select the correct option.
A) 180 B) 144 C) 200 D) 212 E) 220
Explanation:   Let first number be x.   So,2nd no. = 4x &amp; 3rd no.=8x.   So,x+4x+8x=78 × 3 = 234.   13x = 234   x = 234/13   Hence,smallest Number x=18.   The greatest of three number is 8 x 18=144   Answer:144
<result>B</result>
Of three numbers, the third is twice the second and the second is 4 times the first. If their average is 78, the greatest of the three numbers is: