Question

If 20 assemblers can complete a certain job in 6 hours, how long will the same job take if the number of assemblers is cut back to 8?

Answer 1

`15`

Step-by-step explanation

For 1 assembler, it will take;

`\begin{gathered} 20* R*6=1 \\ R=(1)/(120) \end{gathered}`

For 8 assemblers;

`8* R* T=1`

Substitute R

`\begin{gathered} 8* R* T=1 \\ 8*(1)/(120)* T=1 \\ (8T)/(120)=1 \\ 8T=120 \\ T=(120)/(8) \\ =15 \end{gathered}`