### If the arithmetic mean of 0, 5, 4, 3 is a, that of -1, 0, 1, 5, 4, 3 is b and that of 5, 4, 3 is c, then the relation between a, b, and c is.

A. a = b = c B. a : b : c = 3 : 2 : 4 C. 4a = 5b = c D. a + b + c = 12 Answer: Option B

### Solution(By Apex Team)

We have \begin{aligned}&a=\frac{0+5+4+3}{4}=3\\ &b=\frac{-1+0+1+5+4+3}{6}=2\\ &c=\frac{5+4+3}{3}=4\\ \therefore\ &a:b:c=3:2:4\end{aligned}

A. 20
B. 21
C. 28
D. 32

A. 18
B. 20
C. 24
D. 30

A. 10 years
B. 10.5 years
C. 11 years
D. 12 years