Someone help me please. I think it’s 35 but I’m not sure

40

Step-by-step explanation:

The first triangle is 1/2 the size of the bigger triangle, you would just multiply 20 by the ration you have which is 2 and you get 40

V(volume of pyramid) = ⅓ x V(volume of prism)

And, to get the volume of prism, simply multiply the volume of pyramid by 3.

if volume of pyramid=12m³, then volume of prism is 36 m³.

Solution;:

V(volime of prism) = V(volume of pyramid) x 3

Hence, there are 3 pyramids, and each pyramid has a volume of 12m³, these can exactly fit inside a prism with a volume of 36m³.