I’m really confused with this question about finding out the cost for an amount of guests. Please help asap!

What adds to be the bottom number but also multiplies to be the top number with 8 on the bottom and 15 on top

The legs of a right triangle measure 6 meters and 8 meters. what is the length of the hypotonuse.

Abook store is having a 30 perscent off sale. diary of the wimpy kid books are now 6.30 dollars each what was the original price of the books