The average of p, q, r is 12, then what will be the average of r and s?
Answer & explanation
Correct answer: option 3
Average = $\frac{sum\; of\; numbers}{quantity}$
$\frac{p+q+r+s}{4}$ = 30 -------(i)
We also know. average of p and q = 12
⇒ $\frac{p+q}{2}$ = 12
⇒ p + q = 12 x 2 = 24 ---------------(ii)
Putting the value of p and q in eq(i)
$\frac{24+r+s}{4}$ = 30
24 + r + s = 120
r + s = 96
Average of r and s = $\frac{r+s}{2}$ = $\frac{96}{2}$ = 48