Question

please help me with the question​

Answer 1

By the problem,ages of

P=2Q

Q=2R

R=2S

Average of their ages is 15.

P+Q+R+S/4=15

P+Q+R+S=60

2Q+Q+2S+S=60

3Q+3S=60

3(Q+S)=60

Q+S=20

Therefore Q+S=20

Brainliest please