If 8 carpenters can make 50 chairs in 10 days, how many carpenters are needed to make 75 chairs in 10 days?
The carpenters need to produce 75 / 50 = 
<gadget id="calculator">75/50</gadget>
<output>3/2 = around 1.5</output>
1.5 times as many chairs in the same number of days.
It will require 1.5 times as many carpenters to produce the extra chairs, so 8 * 1.5 = 
<gadget id="calculator">8*1.5</gadget>
<output>12</output>
12 carpenters will be required.

<result>12</result>