Sick

Six seamstresses should make 60 shirts in five business days. After three days two seamstresses were sick. How many days have the remaining seamstresses to finish contract?

Correct result:

t =  3

Solution:

$$\begin{gathered} a=60\mathrm{/}(5\cdot 6)=2 \\ b=60-3\cdot 6\cdot a=60-3\cdot 6\cdot 2=24 \\ t={\displaystyle \frac{b}{a\cdot (6-2)}}={\displaystyle \frac{24}{2\cdot (6-2)}}=3 \end{gathered}$$

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