Single correct option
A can complete a job in 12 days and B in 18 days. They work together for 4 days, after which A leaves. In how many more days will B finish the remaining work?
- A. 6
- B. 8
- C. 9
- D. 10
Show answer and solution
Answer: (B) 8
Take the work as LCM(12, 18) = 36 units. A does 3 units/day, B does 2 units/day.
In 4 days together they do 4 × 5 = 20 units. Remaining = 16 units.
B alone needs 16 ÷ 2 = 8 days.
Tip: Assigning total work = LCM of the individual times avoids fractions.
In 4 days together they do 4 × 5 = 20 units. Remaining = 16 units.
B alone needs 16 ÷ 2 = 8 days.
Tip: Assigning total work = LCM of the individual times avoids fractions.
Saved on this device. Sign in or create a free account to keep it on every device.