Time and Work Practice Test 3 with solutions

Work done by 12 students in one day = $\frac{1}{7}$
Work done by 12 students in 3 days = $\frac{3}{7}$
Work left = $\frac{4}{7}$
Remaining work can be done by 12 students in 4 days.
Number of days taken by 8 students to complete the remaining work = $\left(\frac{12\times 4}{8}\right)$ days = 6 days