Not sure if this is correct or not but my answer is 48
These were my steps:
2(6+(12divided(3+1)-1
2x6=12. 3+1=4 4-1=3
12divided by 3 =4
So now all we have are 12 from (6x2) and 4 from 12div. By3
Then we multiply 12 with the 4 which =48
Hope that helped and made sense.
see the attached figure to better understand the problem
we know that
if OP ll LN
then
by proportion
we have that
substitute
therefore
<u>the answer is</u>
The value of y is 
Most student scored from 70-79
I'm pretty sure that this is a Rectangular Prism.
I hope this helped. ^_^
