Question

p, q, r, s, t are some numbers such that the average of p, q and r is 5 and that of s and t is 10 what is the average of all five numbers

Answer 1

given,

(p+q+r)/3= 5 and (s+t)/2=10

$= > p + q + r = 15$

and

$s + t = 20$

adding both eqns,

p+q+r+s+t= 35

dividing both sides by 5 gives us the avg ie, 7.