# If 12 workers can plant 1320 seedlings in five hours, how long would it take 8 workers or 15 workers?

Aug 12, 2017

$8$ workers = $7 \frac{1}{2}$ hours
$15$ workers = $4$ hours

#### Explanation:

Firstly divide $1320$ by $12$ to get $110$.

$\frac{1320}{12} = 110$

Then divide $110$ by $5$ to get the amount planted per person per hour, which is $22$.

$\frac{110}{5} = 22$

Then times $22$ by $8$ to get $176$, then divide that by $1320$ to get the amount of hours, which is $7 \frac{1}{2}$.

$22 \times 8 = 176$

and,

$\frac{1320}{176} = 7 \frac{1}{2}$ hours.

Then do exactly the same for 15 workers.

$22 \times 15 = 330$

$\frac{1320}{330} = 4$ hours.