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People needed to finish a task in fewer days
16 people
💡 What it's asking: Measure the whole task in person-days (one person working one day). The total work stays the same; share it over 5 days.
- Total work = 10 people × 8 days = 80 person-days.
- To finish in 5 days, each day needs 80 ÷ 5 = 16 person-days.
- So 16 people are needed.
✅ Fewer days need more people: 16 × 5 = 80 person-days, the same work.
සිංහලෙන් විසඳුම
මුළු කාර්යය පුද්ගල දිනවලින් (එක් අයෙකු දිනක් කරන වැඩ) මනින්න. මුළු වැඩය නොවෙනස්ව පවතී; එය දින 5 කට බෙදන්න.
- මුළු වැඩය = පුද්ගලයන් 10 × දින 8 = පුද්ගල දින 80.
- දින 5 කින් අවසන් කිරීමට දිනකට 80 ÷ 5 = පුද්ගල දින 16 ක් අවශ්යයි.
- එබැවින් පුද්ගලයන් 16 ක් අවශ්යයි.
Uniform speed from distance and time
30 km/h
💡 What it's asking: Uniform speed means the same distance every hour. Divide the distance by the time.
- Distance = 120 km, time = 4 hours.
- Speed = distance ÷ time = 120 ÷ 4.
- Speed = 30 km/h.
✅ In 4 hours at 30 km/h you travel 4 × 30 = 120 km. Correct.
සිංහලෙන් විසඳුම
ඒකාකාර වේගය යනු සෑම පැයකම එකම දුරක් යාමයි. දුර කාලයෙන් බෙදන්න.
- දුර = 120 km, කාලය = පැය 4.
- වේගය = දුර ÷ කාලය = 120 ÷ 4.
- වේගය = 30 km/h.
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