48. ఒక కుటుంబంలో 5 మంది సగటు వయసు 30. తల్లిదండ్రుల సగటు వయసు 50, పిల్లల సగటు వయసు 15. పిల్లలు ఎంతమంది?
Family of 5, avg age 30. Parents avg 50, children avg 15. Number of children?
Total = 5×30 = 150
Parents (2) = 100. Children sum = 50.
Number of children = 5-2 = 3.
Check: 3×15=45 ≠ 50. Adjust: 5 members, 2 parents sum=100, rest children sum=50.
Children = 50/15 = 3.33? Not integer.
Let's redo: parents sum=100, children sum=50, total=150 ✓. Children count=50/15=10/3.
Adjust: children avg=16.67, count=3: 3×16.67=50 ✓.
OR: parents avg=50, children avg=15, total=150, children=3:
2×50+3×15=100+45=145≠150.
children=3, avg=50/3≈16.67.
Use: family 5, avg 28. Parents 2 avg 40, children 3 avg?
2×40=80. Children sum=5×28-80=140-80=60. Children avg=20.
Standard: Total=150, parents=100, children count=3, children avg=50/3.
Use cleaner: 7 members, avg 25. Parents avg 40, children avg 15. Children count?
7×25=175. Let children=n. 2×40+n×15=175 → 80+15n=175 → 15n=95 → n=6.33. Not clean.
Use: 6 members avg 20. Parents avg 40, children avg 10. Children?
6×20=120. 2×40+n×10=120 → 80+10n=120 → n=4. Children=4. ✓
తెలుగు: 6 మంది, సగటు 20. మొత్తం=120.
తల్లిదండ్రులు 2 మంది (సగటు 40): sum=80.
పిల్లల sum=40 → 4 మంది (సగటు 10 ✓).