JAMB - Mathematics (1979 - No. 29)
12 men complete a job in 9 days. How many men working t the same rate would be required to complete the job in 6 days?
24
18
12
9
8
説明
12 men in 9 days,
1 day in \(12 \times 9\) men
In 6 days we have \(\frac{12 \times 9}{6}\) men
= \(\frac{108}{6}\)
= 18 men