We can use unitary method here.
First let us use the basic conversion from tons to ounces.
1 ton =32000 ounces
Now we have to find how many ounces are there in 1.5 tons.
Weight of hippopotamus in tons =1.5 tons
Weight of hippopotamus in ounces = 1.5 *32000 = 48000 ounces.
So the weight of hippopotamus in ounces is 48000 ounces.
