Question

if there are currently 45 heavy lifters at factory a and company increases it's fleet by 60% , how many total lifters will be at factory a and factory b after they are redistributed

Answer 1

$$\def\arraystretch{1.5} \begin{array}{c:c} 2009 & 2010 \\ \hline Factory\ A\ 15\% & Factory\ A\ 20\% \\ \hdashline Factory\ B\ 15\% & Factory\ B\ 35\% \\ \hdashline \end{array}$$

As in 2009 the Factory A had 45 lifters and it is the 15% of the total quantity therefore the total quantity was

$$45\cdot\dfrac{100\%}{15\%}=300\text{ lifters}$$

In 2010 the company increase it’s fleet by 60% and now it has 

$$300\cdot\dfrac{160\%}{100\%}=480\text{ lifters}$$

The factories A and B have the $20\% + 35\% = 55\%$ of the total quantity of lifters and it’s $480\cdot\dfrac{55\%}{100\%}=264\text{ lifters}.$

$264\text{ lifters}.$