Arrows cost $6.50 each and a reed pipe costs $7.25 each How much would 3 arrows and 4 reed pipe cost altogether

It would be 48.5

Explanation:

onto a large boat, and mark the water level that the boat sinks to. then, take the elephant out and put a bunch of marked weights onto the boat until it reaches the same water level. add up the masses of the weights to get the weight of the elephant.

they would have to clean it very clean