If A is $\frac{1}{6}$ of C, and B is twice of A, and the average of A, B and C is 30, then the difference between A and C is:
Answer & explanation
Correct answer: option 3
Let C = 6
A : B : C
1 : 2 : 6
Average = $\frac{9r}{3}$ = 30
3r = 30 or r = 10
Difference between A and C = 5r = 50