Question

A can do a certain job in 12 days. B is 60% more efficient than A. What is the number of days it takes B, to do the same piece of work ?

• A. 5
• B. 7.5
• C. 9.5
• D. 10

Answer 1

The correct option is B 7.5

A's 1 days' work =$\frac{1}{12}$

$\therefore$ B's 1 days' work = $\frac{1.6}{12}=\frac{16}{120}=\frac{2}{15}$

$\therefore$ B shall complete the work in $\frac{15}{2}$ days $=7\frac{1}{2}$ days