15 cattle can graze a field in 20 days 20 cattle can graze 3 such field in how many days?
Correct answer: B. 45
- A. 30
- B. 45
- C. 60
- D. 50
Explanation
Fifteen cattle graze 1 field in 20 days, so one field requires 15 × 20 = 300 cattle-days. Three fields require 3 × 300 = 900 cattle-days, and 20 cattle take 900 ÷ 20 = 45 days. The likely mistake is choosing 30 days by multiplying the number of fields but failing to adjust for the increase from 15 to 20 cattle.
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