Answer: 13/15
Step-by-step explanation:
1/5 + 2/3 = 13/15. Since 13/15 can’t be simplified, that’s your answer.
Six fifths =

.
You can multiply the numerator and denominator by any number to find an equivalent fraction.
Two examples of equivalent fractions would be

and

.
Hope that helped you.
Take a look at the attachment below. It fills in for the attachment that wasn't provided in the question -
An oblique pyramid is one that has a top not aligned with the base. Due to this, the height of the pyramid connects with two vertices at its ends to form a right angle present outside the pyramid, knowing that it is always perpendicular to the base. There is no difference between the calculations of the volume of an oblique pyramid and a pyramid however -

<u><em>And thus, you're solution is 5 cm^3, or in other words option b!</em></u>