Question

$40$ conservancy workers were employed for $10$ days to clean buildings affected by floods. The number of additional workers required to complete the work in $4$ days is

• A. $60$
• B. $50$
• C. $40$
• D. $35$

Answer 1

The correct option is A $60$

$40$ workers can clean the building in $10$ days

Number of workers required to clean the building in $1$ day $=40\times 10=400$

Hence, number of workers required to clean the building in $4$ days $=\frac{40\times 10}{4}=100$

So, number of additional workers required$=100-40=60$.