p, q, r, s, t, are five 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 the five numbers ?

The average of r and s is 7.5, and the average of r, s and t is 11. What is the value of t?

Five years ago, the average age of P and Q was 15 yr. Now, average age of P, Q and R is 20 yr. What whould be the age of R after 10 yr?

If p, q, r be three positive numbers such that p gt q gt r . when the smallest number is added to the difference of the rest two number, then the average of the resultant number and the original numbers except to the smallest number is 21 more than the average of all the three original numbers . Find the value of (p – q).

If p, q, r be three positive numbers such that p gt q gt r when the smallest number is added to the difference of the rest two numbers, then the average of the resultant number and the original numbers except to the smallest is 21 more than the average of all the three numbers. The value of (p-q) is :

The average age of P , Q and R is 26 years . If the average age of P and R is 30 years . What is Q's age ?

p,q,r,s,t are first five terms of an A.P. such that P + r + t = -12 and p.q.r = 8. Find the first term of the above A.P. :

P, Q, R, S and T are five prime numbers, where PltQltRltSltT . It is given that P+Q+R+S+T=452 . What is the value of P?