5. Five yr ago, the average age of P and Q11.was 15 yr. Now, average a

1.	5. Five yr ago, the average age of P and Q11.was 15 yr. Now, average age of P, Q andR is 20 yr. What would be the age of Rafter 10 yr?(a) 35 yr(c) 30 yr[SSC (CGL) 20121(b) 40 yr(d) 50 yr
Answer» let age of P Q and R be x y and zthen 5 years agoage of P=x-5age of Q=y-5 average=15yrs(x-5)+(y-5) /2=15x-5+y-5=30x+y=40........(1) x+y+z /3=20x+y+z=60from eqⁿ1 put the value of x+y40+z=60z=20yrs age of R=20yrsafter 10 years age of R=z+10=30yrs

5. Five yr ago, the average age of P and Q11.was 15 yr. Now, average age of P, Q andR is 20 yr. What would be the age of Rafter 10 yr?(a) 35 yr(c) 30 yr[SSC (CGL) 20121(b) 40 yr(d) 50 yr

Answer»

let age of P Q and R be x y and zthen 5 years agoage of P=x-5age of Q=y-5

average=15yrs(x-5)+(y-5) /2=15x-5+y-5=30x+y=40........(1)

x+y+z /3=20x+y+z=60from eqⁿ1 put the value of x+y40+z=60z=20yrs

age of R=20yrsafter 10 years age of R=z+10=30yrs