Answer:
im guessing D sorry if wrong
Answer: 1/4
Step-by-step explanation:
2/5 is 0.4 and 1/5 is 0.2 so we add them which gave us...
0.4+0.2=0.6
10 - 0.6 = 4 left over now we change 4 as a fraction which 1/4
The altitude might be another name for a height of a pyramid, lol, hope this helps