## Ismaiel Kalady is teaching live on Unacademy Plus

TIME & WORK LCM - Efficiency Shortcut Tricks 20 QUESTIONS unacademy

Course Overview Basics of Time & Work Problems LCM (Efficiency) Method . In-depth Analysis of Efficiency method through Questions Advanced Tricks to Solve Quickly . Different Types of Time & Work Problems .Previous Year PSC Questions

7. A can do a piece of work in 20 days and B in 40 days. If they work together for 5 days, then the fraction of the work that is left:

7. A can do a piece of work in 20 days and B in 40 days. If they work together for 5 days, then the fraction of the work that is left: A - 20 2 40 ( LCM) B 401

7. A can do a piece of work in 20 days and B in 40 days. If they work together for 5 days, then the fraction of the work that is left: A - 20 2 40 ( LCM) Total Efficiency of A + B 2+1 3 units Work finished in 5 days 5 x 3 15

7. A can do a piece of work in 20 days and B in 40 days. If they work together for 5 days, then the fraction of the work that is left: A 20 40 (LCM) B 401 Total Efficiency of A+B-2 Work finished in 5 days 5 x 3-15 Work left 40 15 25 Fraction of work left-25-5 +1 3 units 40 8

8. A & B can do a work in 72 days, B and C can do it in 120 days, C and A do it in 90 days. If A, B and C work together, they will complete the work in:

8. A & B can do a work in 72 days, B and C can do it in 120 days, C and A do it in 90 days. If A, B and C work together, they will complete the work in: A+B72 5 B+C-) 1203 C+A904 360 ( LCM)

8. A & B can do a work in 72 days, B and C can do it in 120 days, C and A do it in 90 days. If A, B and C work together, they will complete the work in: A+B72 5 B+C-) 1203 C+A904 360 ( LCM) Total Efficiency A+B+B+C+C+A 2(A+B+C) 5+3+4 12

8. A & B can do a work in 72 days, B and C can do it in 120 days, C and A do it in 90 days. If A, B and C work together, they will complete the work in: A+B - 72 5 C+A90 Total Efficiency A+B+B+C+C+A 2(A+B+C) 5+3+4 12 Efficiency of (A+B+C) 6 Days needed by (A+B+C) 3660 days 360 ( LCM) 4

9. If A, B and C together can finish a piece of work in 4 days, A alone in 12 days and B in 18 days, then Calone can do it in A 12 18 36 (LCM)

9. If A, B and C together can finish a piece of work in 4 days, A alone in 12 days and B in 18 days, then Calone can do it in A > 12 36 (LCM) B - 18 27 Efficiency of C (A+B+C) (A+B) 9 (3+2) 4 Days needed by C-9 days 36