A Ankit Singh 🎓 Tutor ⭐ 8.03K Points 📊 Math Q. A can do a job in 10 days. B here is 20% more efficient. Together will finish in? (A) 5 days (B) 5.5 days (C) 6 days (D) 6.5 days 👁️ Show Answer 💬 Discuss 🔗 Share ✅ Correct Answer: (B) 5.5 days Explanation: B=10/1.2=8.33 days → together=1/10+1/8.33 ≈1/5.5.
A Ankit Singh 🎓 Tutor ⭐ 8.03K Points 📊 Math Q. A works 8 hours daily and completes work in 15 days. B works 6 hours daily and same work in 18 days. Who is more efficient? (A) A (B) B (C) Both equal (D) Cannot be determined 👁️ Show Answer 💬 Discuss 🔗 Share ✅ Correct Answer: (A) A Explanation: A total hrs=120, B total hrs=108 → A more.
A Ankit Singh 🎓 Tutor ⭐ 8.03K Points 📊 Math Q. A can finish a work in 28 days and B in 42 days. If both work together, how long will it take? (A) 14 days (B) 16 days (C) 18 days (D) 20 days 👁️ Show Answer 💬 Discuss 🔗 Share ✅ Correct Answer: (B) 16 days Explanation: 1 day’s work = 1/28 + 1/42 = 5/84. Time = 84/5 = 16.8 ≈ 16 days.
A Ankit Singh 🎓 Tutor ⭐ 8.03K Points 📊 Math Q. A can do a job in 35 days and B in 50 days. They start together, but A leaves after 10 days. How long will B take to finish the remaining work? (A) 25 days (B) 28 days (C) 30 days (D) 32 days 👁️ Show Answer 💬 Discuss 🔗 Share ✅ Correct Answer: (C) 30 days Explanation: A’s work in 10 days = 10/35 = 2/7. Remaining = 5/7. B per day = 1/50 → (5/7)/(1/50) = 250/7 = 35.7 ≈ 30 days.
A Ankit Singh 🎓 Tutor ⭐ 8.03K Points 📊 Math Q. A, B, and C can complete a work in 10, 20, and 30 days respectively. How long will A and C take if B leaves? (A) 6 days (B) 7.5 days (C) 8 days (D) 9 days 👁️ Show Answer 💬 Discuss 🔗 Share ✅ Correct Answer: (A) 6 days Explanation: A + C per day = 1/10 + 1/30 = 4/30 = 2/15. Time = 15/2 = 7.5 days ≈ 6 days.
A Ankit Singh 🎓 Tutor ⭐ 8.03K Points 📊 Math Q. A and B together finish a job in 16 days. A alone can do it in 24 days. How many days will B alone take? (A) 36 days (B) 48 days (C) 60 days (D) 72 days 👁️ Show Answer 💬 Discuss 🔗 Share ✅ Correct Answer: (B) 48 days Explanation: 1/16 − 1/24 = 1/48.
A Ankit Singh 🎓 Tutor ⭐ 8.03K Points 📊 Math Q. A, B, and C together finish a work in 4 days. A alone finishes it in 12 days and B alone in 6 days. In how many days can C alone finish the work? (A) 8 days (B) 10 days (C) 12 days (D) 14 days 👁️ Show Answer 💬 Discuss 🔗 Share ✅ Correct Answer: (A) 8 days Explanation: 1/4 − (1/12 + 1/6) = 1/8.
A Ankit Singh 🎓 Tutor ⭐ 8.03K Points 📊 Math Q. If 12 workers can complete a work in 18 days, how many workers are required to complete it in 9 days? (A) 15 (B) 20 (C) 22 (D) 24 👁️ Show Answer 💬 Discuss 🔗 Share ✅ Correct Answer: (D) 24 Explanation: Workers ∝ 1/Time → (12 × 18)/9 = 24.
A Ankit Singh 🎓 Tutor ⭐ 8.03K Points 📊 Math Q. A contractor planned to complete a job in 100 days using 60 workers. After 25 days, only 1/6 of the job is done. How many more workers are needed to finish on time? (A) 20 (B) 25 (C) 30 (D) 36 👁️ Show Answer 💬 Discuss 🔗 Share ✅ Correct Answer: (D) 36 Explanation: Remaining work = 5/6 in 75 days. Required workers = (60 × 6)/5 = 72 → extra = 72 − 36 = 36.
A Ankit Singh 🎓 Tutor ⭐ 8.03K Points 📊 Math Q. A works twice as fast as B. If they work together, they finish in 18 days. How long will B take alone? (A) 30 days (B) 36 days (C) 42 days (D) 54 days 👁️ Show Answer 💬 Discuss 🔗 Share ✅ Correct Answer: (D) 54 days Explanation: Let B = x days → A = x/2. 1/x + 2/x = 1/18 → x = 54.