Simplify the following.
2((\( \frac{5}{2} \))x² − 28x + 17) − 5(x² + 6x − 18)
Pipe A can fill a tank in 17 hours, pipe B can fill the same tank in 24 hours and pipe C can fill the same tank in 18 hours. The time taken by them to fill the same tank if they operate together is:
10 \( \frac{78}{191} \) hours
6 \( \frac{78}{191} \) hours
16 \( \frac{78}{191} \) hours
13 \( \frac{78}{191} \) hours
By how much is 65% of 75 greater than \( \frac{3}{5} \) of 25?