Extra workers needed to finish a job sooner
10 more men
💡 What it's asking: Measure the job in man-days (one person working for one day). Then share those man-days over fewer days.
- Total work: 6 × 8 = 48 man-days.
- In 3 days you need 48 ÷ 3 = 16 men.
- 6 men are already there, so 16 − 6 = 10 more.
✅ 16 men × 3 days = 48 man-days, the same as before.
සිංහලෙන් විසඳුම
කාර්යය මිනිස් දිනවලින් (එක් අයෙක් එක් දිනක් වැඩ කිරීම) මනින්න. පසුව එය අඩු දින ගණනකට බෙදන්න.
- මුළු කාර්යය: 6 × 8 = මිනිස් දින 48.
- දින 3 කින්: 48 ÷ 3 = මිනිසුන් 16.
- 6 දෙනෙක් දැනටමත් සිටින නිසා තවත් 16 − 6 = 10.
Angle in a triangle using parallel lines and crossing lines
BAE = 30°
💡 What it's asking: Move the 40° up to B using parallel lines, then use the outside angle of triangle ABE.
- AB and CD are parallel, so the Z-shaped angles at B and C are equal: ABE = 40°.
- The 70° at E is outside triangle ABE.
- Outside angle = the two far inside angles added: 70° = BAE + 40°.
- BAE = 30°.
✅ Triangle ABE: 30° + 40° + 110° = 180°.
සිංහලෙන් විසඳුම
සමාන්තර රේඛා භාවිතයෙන් 40° B වෙත ගෙන ගොස්, ABE ත්රිකෝණයේ බාහිර කෝණය යොදන්න.
- AB සහ CD සමාන්තර නිසා B සහ C හි Z හැඩ කෝණ සමානයි: ABE = 40°.
- E හි 70° කෝණය ABE ත්රිකෝණයට පිටතින් ඇත.
- බාහිර කෝණය = දුර ඇති අභ්යන්තර කෝණ දෙකේ එකතුව: 70° = BAE + 40°.
- එවිට: BAE = 30°.
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