How much extra water does a 147-lb concrete canoe displace compared to an ultralightweight 38-lb kevlar canoe of the same size carrying the same load?

We use the formula, to calculate the volume of water displaced by concrete canoe,

Here, W is the weight of concrete canoe and is the specific weight of water and its value is .

So,

.

Now the volume of water occupied in ultra lightweight kevlar canoe,

Here, w is weight of  kevlar canoe.

So,

Thus, the volume of water displaced,

.

Hence, the volume of water displaced canoe compared to an ultra-lightweight  kevlar canoe is

the reason is because the moon has some form of gravity, and that gravity pulls the ocean tides.