Question 19
Back to Exercise
A worker plans to finish a job in 15 days, but he works at only 80% of the planned speed. How many extra days does he need?
- A 3 days
- B 3.75 days Correct
- C 18.75 days
- D 4 days
Correct Answer: Option B
Time ∝ 1/speed
Actual time = 15 ÷ 0.8 = 18.75 days
Extra = 3.75 days
Trap: 20% of 15 = 3 days treats it as direct.
Answer: 3.75 days
Discussion & Comments 0
Share your method, a shortcut, or ask about a step you didn't follow.
No comments yet. Be the first to share your solution!